According to Princeton psychologist Julian Jaynes in his seminal work The Origin of Consciousness in the Breakdown of the Bicameral Mind there was a time when man had no consciousness– which he defined as a “subjective conscious mind” or “an analog ‘I’ narratizing in a functional mind-space.” Jaynes goes on to say that the

Jaynes theorized that in ancient man the mind was divided into two chambers. [If you’re not familiar with the bicameral theory of mind please read the short summary here: https://manicmatter.com/origin-consciousness-bicameral-mind/.] One of these chambers was used for basic functions which the individual had either been taught by their culture (like hunting, making shelters, etc) or learned and repeated many times while the other chamber was only used in the rare circumstance that a person encountered a novel, dangerous situation. This type of person was said to be bicameral, they lacked the ability to introspect or reason with logic so when they encountered a situation like a bear suddenly emerging from a cave nearby the other chamber of their mind would use past experience to tell the man side of the mind what to do– this was experienced as an auditory hallucination.

In his investigation of consciousness Jaynes studied philosophy then animal behavior before moving on to human physiology, but he had become frustrated by a lack of progress before deciding to examine ancient literature and art. While comparing the Iliad to The Odyssey an interesting detail emerges, consciousness seems to be absent in the Iliad, the older work, where all action is seemingly driven by the gods. When compared with The Odyssey you’ll notice that Odysseus is capable of hallmarks of consciousness like long-term planning and deception. According to Jaynes, man acquired consciousness around 3,000 years ago in the Middle East (the date varies based on location), but in-between the time of the bicameral era and that of modern consciousness was a period in which the voices had begun to grow silent. More specifically, there was an intermediary period where much greater levels of stress were required to elicit an auditory hallucination. This time period is described in greater detail in the following paragraph by Jaynes:

Metaphor is sometimes thought of as a simple literary device, but its importance can’t be overstated. Metaphor is the often overlooked and undervalued engine which provides much of the power of language, and it allows for the exponential expansion of our otherwise concrete system of symbols. The word metaphor comes from the Greek word metaphora, meaning “a transfer,” particularly in “the sense of one word to a different word, literally “a carrying over.”[2] Like it’s name suggests, a metaphor transfers the usage of one term, or phrase, to describe something else because of a perceived similarity of the two things, or because of a certain relationship which the objects share.

According to the Bicameral Theory of Mind, metaphor was essential to the development of consciousness, which Jaynes defined as “that which is introspectable,” or “an analog ‘I’ narratizing in a functional mind-space.” What exactly is a functional mind-space, and what does metaphor have to do with it? Since a metaphor transfers the usage of one term, or phrase, to describe something else because of a perceived similarity of the two things, or because of a certain relationship which the objects share, it allows one to distill the essence of something so that it can be easily communicated to someone else– in a similar way metaphor could allow for the easier mental manipulation of what would otherwise be too complex to process, or store in short-term memory. In essence conscious man’s brain is distilling their environment and situation so that it can be communicated to the individual whereas preconscious hypostases man’s brain is performing a similar function except it’s reading the environment using feedback from various bodily systems and then relaying that information to the brain. [For an in-depth discussion of the importance of metaphor toward consciousness see my previous post: https://manicmatter.com/metaphor-mind/.]

Phrenes, or respiratory changes, are highly variable based on the activity that an individual is engaged in, these changes can cause a cascade of physiological responses throughout the entire body. Diaphragmatic breathing, for example, increases the efficiency of oxygen exchange which in turn slows the heartrate and it can lower or stabilize blood pressure. Jaynes points out how certain respiratory patterns are associated with environmental stimulations like the startle response being “correlated with partial or complete inhibition of breathing” and how activity or excitement increases “both the rate and depth of breathing with the resulting internal stimulation.” Jaynes goes on to explain how the respiratory cycle is also altered by speech, laughter, fright, etc, where generally speaking the more stimulated a person is the higher proportion of time they spend inhaling versus exhaling. So the respiratory system follows distinct, measurable patterns which reflect the outside world, or as Jaynes describes in the following quote:

Kradie, which Jaynes translates as cardiac changes, also reflect the outside world in real-time in a way similar to the respiratory system and they are also used in the Iliad as a metaphoric container where strength or boldness could be put into by the gods. The heart has been shown to influence how we perceive and interact with the world, while also constantly communicating with the brain in several different ways– thanks in part due to it having over 40,000 neurons of its own.[3] Jaynes describes the modern usage of kradie in the following section:

Etor is also sometimes translated to mean heart, or cardiac changes, but Jaynes says that it’s actually derived from the word etron which means belly. Over the last several decades the gastrointestinal tract has gotten much more attention as it has been shown to create numerous neurochemicals and also respond to even mild emotional stimuli. The preceding four preconscious hypostatses all act as internal mirrors of the external world so it shouldn’t be too surprising that they may have been partially responsible for the creation of a functional mind-space at a later date. But just as they reach from the past into the present world through recorded writings like the Iliad they also retain some of their original functions and this can be seen in various ways, Jaynes describes one of the most obvious in the following section:

In 1872 Charles Darwin wrote about the significance of the “bidirectional neural communication between the heart and the brain via the “pneumogastric” nerve, now known as the vagus nerve. For Darwin, emotional state represented a covariation between facial expression and autonomic tone.”[4] The vagus nerve (vagus is Latin for “wanderer”) is the largest nerve in the human body and winds throughout it, touching most of the major organs along the way. Research conducted over the last several decades has elucidated the significance of the vagus nerve towards mankind’s instincts/stress responses, autonomic state, social communication, and self-soothing behaviors, much of this research has been conducted by Dr. Stephen Porges who is director of the Brain-Body Center at the University of Illinois at Chicago. Dr. Porges also introduced a theory known as the polyvagal theory which states that the vagus nerve developed phylogenetically (that is through the evolutionary history of an organism) where the most primitive systems are only activated if the more evolved functions fail. The oldest portion of the vagus nerve is present in most vertebrates and is characterized by being unmyelinated, it assists in digestion and is associated with the “freeze” response or feigning death. The second portion is characterized by the sympathetic nervous system which is associated with the fight or flight response. Dr. Porges describes the final portion of the vagus nerve in the following section:

The polyvagal theory has wide ranging implications when it comes to many facets of human behavior and has been used extensively in therapy with people that suffer from PTSD or other traumas. Bessel van der Kolk who is a professor of psychiatry at the Boston University School of Medicine describes the importance of the theory in the following way:

The Polyvagal Theory provided us with a more sophisticated understanding of the biology of safety and danger, one based on the subtle interplay between the visceral experiences of our own bodies and the voices and faces of the people around us. It explains why a kind face or a soothing tone of voice can dramatically alter the way we feel. It clarifies why knowing that we are seen and heard by the important people in our lives can make us feel calm and safe, and why being ignored or dismissed can precipitate rage reactions or mental collapse. It helped us understand why attuning with another person can shift us out of disorganized and fearful states. In short, Porges’ theory makes us look beyond the effects of fight or flight and put social relationships front and centre in our understanding of trauma. It also suggested new approaches to healing that focus on strengthening the body’s system for regulating arousal.[6]

Dr. Puya Yazdi commented that the vagus nerve is “largely responsible for the mind-body connection” while Christopher Bergland, a Psychology Today writer, said that “When people say ‘trust your gut,’ they are in many ways saying, ‘trust your vagus nerve.’ Visceral feelings and gut instincts are literally emotional intuitions transferred up to your brain via the vagus nerve.”[7,8] The vagus nerve connects all of the major organs of the body, including all of the major preconscious hypostases, and allows them to work in concert while also integrating them with the brain, the muscles of the face, and an emergent “social engagement system” which is described in the following paragraph:

Environmental dependency syndrome is a condition which was first written about over three decades ago but not well understood as it was never extensively studied. The condition is a specific type of utilization behavior which alters an individual’s personal autonomy in distinct ways, a person with utilization behavior has difficulty resisting the urge to use an item appropriately at an inappropriate time– so they may pick up a toothbrush and begin brushing their teeth in a dentist’s office because a toothbrush was on a table in front of them. Environmental dependency syndrome is more subtle and complex than many utilization behaviors, and it’s described in greater detail in the following paragraph:

I have personal experience with this condition as I had it for the first two decades or so of my life along with what I think is a related condition known as alexithymia. Alexithymia occurs in about 10% of people and is characterized by the “subclinical inability to identify and describe emotions experienced by one’s self or others.”[10] A person with this condition may confuse physical sensations like an increased heartrate or a warm shower with emotion, interestingly one of the preconscious hypostases is part of the etymology of the word which is derived from “Greek: ἀ- (a-, ‘not’) + λέξις (léxis, ‘words’) + θῡμός (thȳmós, ‘heart’ or ’emotions’ or ‘seat of speech’) (cf. dyslexia), literally meaning “no words for emotions.”[11] I believe that both of these conditions are related to the preconscious hypostases, looking at the diagram below note how a person with environmental dependency syndrome follows the same pattern of responding to stimuli with the exception that they have an internal mind-space. From my own experience I would say that people with environmental dependency syndrome retained the preconscious hypostases “response-mode” because of a combination of various factors such as being an extremely visual thinker (as opposed to verbal), and likely genetic or epigenetic inheritance.

Evidence shows that Neanderthals had a much larger occipital lobe (which is the visual processing center of the brain as it contains most of the visual cortex) and larger eyes than modern humans as well as “a significantly larger proportion of neural tissue associated with somatic (relating to the body) and visual function compared with the brains of AMH (anatomically modern humans).”[12] Another interesting feature of Neanderthal skulls/brains is the presence of an occipital bun, a prominent bulge at the base of the skull, which was common in early modern Europeans but is fairly rare nowadays.[13] As of now there are no substantiated theories as to the exact purpose of the occipital bun but one could surmise that it allowed for Neanderthal’s larger occipital lobe, this region of the brain is much more important for hunter-gatherers than agriculturalists. Whereas contemporary humans had evolved in Africa, Neanderthals evolved in the much higher latitudes of Europe where the landscape is colder and the light levels are much lower which is thought to be the reason why so much of their brain was dedicated to visual processing- this would lead to a reduction of brain space for social cognition.[14] Clive Gamble, an archaeologist at the University of Southampton states that “we have a social brain, whereas Neanderthals appear to have a visual brain.”[15]According to Jaynes language developed much later than most linguists theorize, primarily between the years 70,000 BC to 8,000 BC, and it can be traced most directly through inspecting the archaeological record for material goods. Jaynes states that rock tools which were primarily handaxes are among some of the only examples of technology which predates this range and that their construction was likely transmitted solely by imitation as “it is almost impossible to describe chipping flints into choppers in language.”[1] Anatomically modern humans had begun to migrate into Europe by around 43,000 BC, shortly afterwards Neanderthals had became extinct, sometime around 38,000 BC, it’s thought by some experts that their extinction was largely due to decreased cognitive flexibility which would lead to a decreased ability to learn and also adapt to climate change.[16] Looking at Jaynes’ timeline of language development (which wouldn’t necessarily be the same in all parts of the ancient world) by the time Neanderthals had became extinct only calls, modifiers, and commands were in use– a very rudimentary language which would be reactionary and not allow for abstractions like communicating something not present. In the development of language each new stage allowed for an increased ability to communicate and thus survive, Jaynes used the example of how the creation of a verb like ‘sharper’ allowed ancient man to communicate an entirely new concept which would increase the quality of tools which they created. Jaynes describes the importance of these changes in the following section:

It would appear that the vagus nerve plays an essential role in the operation of the preconscious hypostases in ancient man, that is it allows for the internal sensations from several essential organs of the body to be transmitted to the brain. Many experts have noted that the vagus nerve is largely responsible for the mind-body connection which would make sense as a person in the preconscious hypostases stage of mind would essentially operate under a “body-mind” control mechanism when they encounter stress or a novel stimulus. The four most important preconscious hypostases all act as internal mirrors of the external world so logically they would be a large contributor to the ultimate internal mirror of the external world which is consciousness– that is mind-space. Environmental dependency syndrome appears to be a retention of the body-mind response-mode with the exception that the individual has an internal mind-space. The condition may result in hyperfocus on their thoughts and issues with emotional self-regulation perhaps because of a lack of adaptations related to consciousness and an extremely visual cognitive method. There have been very few studies on environmental dependency syndrome but I believe that it’s much more common than one may think by looking at the research which is largely focused on people with brain trauma or lesions. There doesn’t appear to be any research on the topic of a possible comorbidity of environmental dependency syndrome and alexithymia but both conditions are related to a disconnect between the conscious mind and body. Individuals with alexithymia have a difficult time distinguishing emotions and according to Jaynes’ Two-tiered Theory of Emotion consciousness is required for higher level emotions, he describes this in greater detail in an essay which was first printed in 1982 and was reprinted more recently in The Julian Jaynes Collection. Jaynes briefly describes the theory in the afterword of The Origin of Consciousness in the Breakdown of the Bicameral Mind:

Since they died out 38,000 years ago Neanderthals wouldn’t likely have achieved consciousness, especially considering the fact that so much of their brain space was dedicated to vision. Jaynes repeatedly pointed out that the acquisition of consciousness wouldn’t have required a genetic change because it’s essentially a change in software operating with the same hardware, but I think that there’s a genetic or epigenetic change which some individuals have which allows for better regulation of behavior and thought. Note that people with the previously mentioned conditions have consciousness but they may not have all of the same genetic adaptations to consciousness– this could quite possibly be a retention of neanderthal genes or traits.

One of the most characteristic abilities of humans is the ability to produce and understand complex language that is primarily abstract and metaphorical in nature. This stands in stark contrast to the gestures and innate calls of other animals which are reactive in nature, that is to say animals can only communicate about items in their immediate environment while human speech doesn’t rely on environmental triggers.[1, 2] Since the early development of language didn’t leave a distinct archaeological record which can be examined, in order to study its development we must examine physical evidence such as the tools left behind by early man as well as neurological studies, many of which compare the brain of man to that of closely related primates.

Hominins have been using stone tools for at least 2.6 million years, the earliest of these were made by using a hard cobble, known as a hammerstone, to strike off flakes from a softer piece of stone known as a core.[See image below, Figures 1, 2, Video 1] These early stone implements are referred to as Oldowan tools, despite being simple flakes and choppers which were only worked on one surface they were in use for almost one million years. It’s unclear which hominin species initially created these tools, but one thing which is clear is that multiple species ended up using them, including several members of the Homo family including H. australopithecus, H. habilis, H. ergaster, and early Homo erectus.[3] These simple implements were gradually replaced by the more advanced Acheulean tools starting around 1.75 million years ago– an important note here is that the older tools continued to be used, and manufactured, despite the advancement.[4]

Acheulean tools, which were predominantly pear-shaped handaxes, were worked symmetrically on both sides so that they could fit in the palm while also having a much larger cutting surface, this level of attention to detail and standard form seems to indicate a great cognitive stride had been made.[See Figures 3, 4, Videos 2, 3] Whereas early stone tools required only a single hammerstone, the production of Acheulean handaxes is a multistage process which required at least two types of hammerstones, a coarse stone for abrasion, and a baton made of antler, bone, or wood, for knocking thin flakes off of the stone.[5, See Figure 5]

When you compare the simple pebble tools of the Oldowan Industry to those of the Acheulean it becomes obvious that these later tools require much greater motor skill, a knowledge of the properties of stone, and also careful planning in order to create an intentionally shaped tool.[5] In a detailed analysis of the Oldowan Industry from a primatologist point of view Wynn and McGrew (1989) came to the conclusion that “all the behaviour that can be inferred from Oldowan tools and sites falls within the range of the ape adaptive grade. There is nothing exclusively human-like about this oldest known archaeological evidence.”[6] The authors of the study made this assessment based primarily upon how early stone tools could be manufactured using simple spatial concepts, they aren’t symmetrical, and could be created by repeatedly striking a hammerstone against a core/cobble within close proximity– living apes follow similar procedures to create various tools which they employ. In contrast, Acheulean tools were worked symmetrically on both sides, and many of these tools incorporate hand/finger grips, rounded ends to distribute shock over the entire palm, and even centrally located fossils which may indicate aesthetic concern.[See examples 7, 7a, 7b, 8, 9, 9a, 10, 10a, 11, 11a, 12, 12a, 12b]

Many anthropologists consider the use of symbols to be an essential if not defining aspect of culture, which has been defined by the founder of cultural anthropology Edward B. Tylor as “that complex whole which includes knowledge, belief, art, morals, law, custom, and any other capabilities and habits acquired by man as a member of society.”[13] Anthropologist Ralph L. Holloway, Jr. stated that the definition of culture should also include the “imposition of arbitrary form upon the environment” as “these two attributes are specific and unique to human behavior, and they can be identified by the appearance of stone tools in the archaeological record.”[14] An important characteristic of the tools of early man is their non-iconic nature (indicated by the term arbitrary form), when you compare these early tools to those of animals you see that even the tools of primates are iconic, as in a stick used for fishing for termites is still a stick despite having the leaves removed from it. In contrast, the standardized form of Acheulean tools indicates that there are systematic rules which one must follow in order to transform a stone into a handaxe. Holloway points out that these chained actions are a type of grammar consisting of a “basic ‘vocabulary’ of motor operations– flake detachment, rotation, preparation of striking platform, etc.” Holloway describes the grammar of tool-making in greater detail in the following section:

An important component of culture is the feedback cycle created by the tools, or arbitrarily structured environment, as the “altered environment shapes (man’s) perceptions, and these are again forced back upon the environment, are incorporated into the environment, and press for further adaptation.” So early man shapes a rock into a tool and in the process of doing so he shapes his own brain (neural networks, etc) and then once the tool is used it changes how man interacts with the environment which then gives feedback as to its efficiency. Over the last few decades several interesting studies have examined the functional difference in Oldowan versus Acheulean tool-making as well as the importance of stone knapping toward the development of early language, these studies have shone light on the dark recesses of the Early Stone Age (ESA). One particular study used a type of neuroimaging, fTCD, which measures changes in cerebral blood flow to determine which areas of the brain were activated while completing one of two tasks, creating an Acheulean handaxe or a language task.[15] The findings of the study are summed up in the following section:

This study demonstrates that language and tool-making share the same neural pathways, perhaps this is because of the countless generations of hominins activating these networks with the orderly, precise techniques required for Acheulean tool-making– as Princeton psychologist Julian Jaynes said “There is nothing in consciousness [introspectable mind-space] that is not an analog of something that was in behavior first” and likewise, there is no symbolic language without its physical precedent, syntax. [See schematic diagram for “Brain regions activated during speech and action observation, tool-use, word generation, and Acheulean knapping”] Another interesting study used a different type of neuroimaging, PET, which produces real-time three-dimensional images of the brain to map out the areas which are being used by an activity, in this case it was either Oldowan or Acheulean toolmaking by expert subjects.[5] The subjects were all “professional archaeologists with more than 10 years stone toolmaking experience and already familiar with Oldowan and Late Acheulean technologies,” their tasks (which were divided over three days) were to create Oldowan-style tools, Acheulean handaxes, and a control task in which they were instructed to strike cobbles together without using any specific toolmaking techniques. Upon reviewing the results, the researchers noted that, “As expected, expertise was associated with increased IPL [Inferior Parietal Lobule] activation during Oldowan toolmaking. However, contrary to expectation, this activation was strongly bilateral.” They went on to say that it appears that improved handaxe creation is a result of more accurate neural representations of the body-tool combination, and not a consequence of enhanced motor planning/strategy as they had expected. The enhanced sensorimotor representations of the tool-body system could perhaps have been developed through the millennia as hominins worked with stone tools, leading to what is essentially a more accurate neural analog of the body.

The primary area of the brain related to tool usage is the Inferior Parietal Lobule, the left IPL is located at the meeting place of the auditory, visual, and somatosensory (touch, temperature, pain, and limb position) cortexes and it is deeply connected with all of these structures. Because of these connections the IPL is one of the primary areas for processing auditory and visual information and it is particularly important to language comprehension and mathematics– as well as memory retrieval, attention, and theory of mind.[16] The right IPL, on the other hand, “organizes many spatial functions for both sides of the body and for both sides of external space.”[17] The IPL is divided into two parts, the Supramarginal Gyrus and the Angular Gyrus, the AG is associated with complex language functions like reading, writing, and interpreting the meaning of writing; pioneering neurologist Norman Geschwind hypothesized that this area was responsible for translating written word to internal monologue. The right AG is responsible for spatiovisual attention as well as maintaining an awareness of the self through monitoring intended actions and the resulting actual movement, the discrepancy between these two allows the AG to maintain an awareness of the self.[18] While not as involved as the AG, the Supramarginal Gyrus, or SMG, assists in language perception and processing, as well as being a part of the previously mentioned somatosensory cortex of which the SMG is particularly important in the perception of space and the location of limbs. The SMG is also a part of the mirror neuron system which is made up of neurons which are activated when an animal performs a specific action or observes another performing the same action. A recent study conducted using fMRI found that both humans and monkeys have activity in corresponding regions of the brain when observing hand actions and actions performed using simple tools, but in the humans there was additional activity in an area at the front of the left SMG (the left aSMG) while viewing actions performed using tools.[19] The authors of the study stated that the activity in the left aSMG was only present when observing “goal-directed action performed with a mechanical device, vanishing when the goal of the action was omitted from the videos,” this led them to believe that the area had evolved specifically for tool use.

Although both hemispheres are used for language to some degree, in the majority of people (approximately 97%[20]) the left hemisphere is the one where most linguistic processing takes place while the right hemisphere deals with minor functions like intonation/accentuation, prosody, pragmatic, and contextual aspects of language.[21] The areas of the brain involved in language are more numerous than once thought, but the three major areas are Broca’s Area, Wernicke’s Area, and the Inferior Parietal Lobule. A fascinating feature of the cerebral hemispheres is pointed out by neurologist Joseph LeDoux in the following quote:

The above quote from Joseph LeDoux has particular importance to a theory of the origin of human consciousness called the Bicameral Theory of Mind, the creator of this theory, Julian Jaynes theorized that thousands of years ago the human mind was divided into two chambers. [If you’re not familiar with the Bicameral Theory of Mind please read the short summary here: https://manicmatter.com/origin-consciousness-bicameral-mind/]. One of these chambers was used for basic functions which the individual had either been taught by their culture (like hunting, making shelters, etc) or learned and repeated many times while the other chamber was only used in the rare circumstance that a person encountered a completely novel, dangerous situation. This type of person was said to be bicameral, they lacked the ability to introspect or reason with logic so when they encountered a situation like a bear suddenly emerging from a cave nearby the other chamber of their mind would use past experience and tell the man side of the mind what to do– this was experienced as an auditory hallucination, and if this seems hard to believe then one needs only to look at the number of people today who experience hallucinations when under severe stress or isolation.

When reviewing the studies which were cited previously with this theory in mind an interesting picture begins to develop, but before surveying this we should turn to a paper which was referenced by the PET study of Oldowan and Acheulean toolmaking. In a paper titled Functional Precursors to Language and its Lateralization the authors describe how language has a “frame-content mode of organization: at the phonological level, consonant and vowel elements are inserted into syllabic frames; and at the morphological level, stem forms of content words are inserted into syntactic frames.”[22, See image below] The authors of the paper then go on to propose that lateralization of brain function developed first for bimanual coordination, as is seen with stone toolmaking, before being used for language. Returning to the task at hand, the previously mentioned PET study stated that the function of the non-dominant hand is “not simply to execute gestures more typically done with the dominant hand but rather to properly position and support the core to receive the action of the dominant hand.”[5] In other words, the content, or dominant hand, acts upon aspects of the environment which are framed, or held carefully in place, by the non-dominant hand; in this context, what is described here is what could be referred to as the Frame-Content Phenomenon where the dominant hand, which is usually the right one, would act upon the environment in a very direct way while the non-dominant hand would react to the actions of the dominant hand and the subsequent change cascade caused in the environment (mathematically that would be: the actions of the right hand + the change/resistance induced in the environment + past learning + spatial detection = left hand reaction/movement). This has a specific significance to the Bicameral Theory of Mind, as the dominant hand would essentially be the hand of man while the non-dominant would be the hand of god; Jaynes describes the hallucinatory god voice as being made up of “stored-up admonitory wisdom,” and this past learning would be a part of my proposed formula, but there are other factors as well– all of which are characterized by the visual aspect of the right hemisphere, like current visuospatial processing and encoded visual memories which rely on a steady mental frame, aspects of which were learned, while other features were inborn.

The IPL contains what are referred to as multimodal neurons, these neurons are capable of processing various senses simultaneously instead of being specialized for a single function like most neurons. This would seem to be essential for their proper function as the left IPL is located at the meeting place of the auditory, visual, and somatosensory cortexes where it acts as a bridge for the integration of the various senses.[16] Renowned neurologist V.S. Ramachandran has written about how he considers a portion of the IPL, the Angular Gyrus, to be critical to the understanding of metaphors because of its multimodal nature and position at the juncture of the various cortexes[23]. Some linguists consider language to be built from metaphor as there would be a limited number of possible utterances if an individual were to only use words in their most literal sense, but metaphor carries meaning from one object to another because of some similarity between the two. Many metaphors are cross-modal, as in a sharp cheese, loud shirt, or bitter cold, the reason for this would seem to be because we label the unknown in the terms of the known– this labeling would seem to be an essential quality of subjectivity, and interestingly the Angular Gyrus has been shown to “be directly involved when you assign a name to an object or when you read its name.”[16]

According to the Bicameral Theory of Mind, metaphor was essential to the development of consciousness, which Jaynes defines as “that which is introspectable,” or “an analog ‘I’ narratizing in a functional mind-space.” What exactly is a functional mind-space, and what does metaphor have to do with it? Since a metaphor transfers the usage of one term, or phrase, to describe something else because of a perceived similarity of the two things, or because of a certain relationship which the objects share, it allows one to distill the essence of something so that it can be easily communicated to someone else– in a similar way metaphor could allow for the easier mental manipulation of what would otherwise be too complex to process, or store in short-term memory. [For an in-depth discussion of the importance of metaphor toward consciousness see my previous post: https://manicmatter.com/metaphor-mind/.]

A 2010 meta-analysis of the literature on laterality of motor control by Charleston neurologist Iraj Derakhshan came to a surprising conclusion, that Newton’s theory of the laterality of the brain is incorrect. In short, Newton’s theory is that “each hemisphere controls movements of the other side of the body and that the sensations arising from each side achieve consciousness in the opposite hemisphere; i.e. that there are two “endpoints in visuomotor stream,” one for each side of the body”[24] This theory has been accepted for over 300 years as a result of its simplicity, and also because Newton had such a profound influence on physics and mathematics. By providing numerous pieces of evidence after carefully reviewing clinical and experimental literature Dr. Derakhshan demonstrated that

The studies presented previously demonstrate that the right hemisphere is specialized for visuospatial processing, and is similar in many ways to that of both hemispheres of the nonhuman primate, while the left hemisphere is specialized for linguistic processing, syntax, and time, so it would be safe to say that at one time both hemispheres of man were utilized for visuospatial processing and that as language developed it began to build upon the previous functions/structure of the left hemisphere. As this process was happening, likely over a span of hundreds of thousands of years and numerous different species of hominins, the left hemisphere became the place where reality was distilled/subjectified, in the sense that a map, for example, relies on spatial coordinates where the distance between two points is objective (though some maps are more accurate than others, they are still created to represent a specific terrain which should be very similar from case to case) while a novel object, situation, art, etc is always dependent on past experiences and language. Thus we see that the fundamental function of the right hemisphere is to “represent three-dimensional reality of space,” while the role of the left hemisphere is to learn and process language which allows for an awareness that can then be used to subjectively pilot the machine. Derakhshan’s One-way Callosal Traffic Theory has profound implications for Jaynes’ Bicameral Theory of Mind, but before elaborating on this I would like to draw your attention to the following quote from Jaynes:

The picture which is beginning to develop is that for hundreds of thousands of years early hominins created some of their first tools primarily with their right hand, and subsequently left hemisphere, this specialized the motor cortex and other circuits to process syntax. After producing these tools for close to a million years a more advanced type of stonework took shape, this industry, the Acheulean, required much more precision and visuospatial processing skill, this enhanced the right hemisphere’s ability to “frame situations” or focus on what action would be the most likely to be successful, at least mathematically speaking. In a sense, the right hemisphere retained the animal/visuospatial mind as the left hemisphere became more and more accustomed to syntax, time, and subsequently language, thus we get the dualism inherent in the mind of man, where man is constantly in opposition to his animalistic nature. After millennia of framing situations so that man knew where to appropriately inject content he had reached a point where the non-conscious animal mind could be used as a divine source of guidance in times of need: a silent sentry that calculated not just the best possible movement for the left hand under certain conditions, but also the best possible course of action for the bicameral man in a dangerous situation by utilizing Wernicke’s Area (the right hemisphere area responsible for speech production) so that the individual would hear a command telling him what to do. As the conscious mind developed this focus was less strictly limited to specific situations, and manifested as inspiration from past events, both remembered and unremembered, and it could be occasioned by the use of certain drugs, meditation, stress, or other altered states of consciousness. There’s something indescribably beautiful about the left hand being both the hand of god, and of the animal mind, and I have no doubt that this is a large part of why so many ancient, and modern, cultures are biased against the left hand/side– the personal god, and man’s animal nature, stands in contrast to that of holy doctrine. [For more on the negative connotation of left-handedness, see Wikipedia: Bias Against Left-handed People]