| Up from Dragons: The Evolution of Human Intelligence | |
| Author: | John Skoyles and Dorion Sagan |
| Cover Artist: | Russell Farrell |
| Country: | United States |
| Language: | English |
| Publisher: | McGraw-Hill |
| Release Date: | 2002 |
| Media Type: | Print (Hardcover) |
| Pages: | 418 pp |
| Isbn: | 0-07-137825-1 |
| Dewey: | 155.7 21 |
| Congress: | BF431 .S558 2002 |
| Oclc: | 48588305 |
Up from Dragons: The Evolution of Human Intelligence is a 2002 book on human evolution, the human brain, and the origins of human cognition by John Skoyles and Dorion Sagan. The book considers how the brain and genes evolved into their present condition over the course of thousands and millions of years. It was published by McGraw Hill.
The book argues that the earlier ape brain had evolved “mindmakers” and that the human mind arose when these were “rewired” by symbols. This new “mindware” was created by the prefrontal cortex in combination with neural plasticity. This “Symbolic capacity is the ‘missing link’ that changed the ape brain into a human and made mindware possible, allowing symbols to structure the brain”.[1] p. 277 Mindware itself has been evolving for the last 120,000 years and as a result kept reshaping human consciousness, thought and culture. Its last chapter speculates upon the future of human cognition.
The title relates to Carl Sagan (co-author Dorion Sagan's father) and his 1977 book The Dragons of Eden[2] for which this book provides a 25th-anniversary reappraisal.[3]
The book introduces and argues for novel ideas in human evolution, neuroscience, social neuroscience and the humanities.
These are the learning environments humans create.[4] Components of a gifted environment include “a rich variety of representations”,[5] a “stimulating learning environment”,[6] and “’empowering environments’—ones which foster specific paths of development, an opportunity sometimes limited to brief windows of developmental time”[7] It is proposed that such gifted environments are created by adult prefrontal cortex. The potential to create gifted environments predates humans and exists in chimpanzees. But they are limited because as adults chimpanzees lack time, cooperate only weakly and are under constant stress. It was the highly cooperative sociability of humans that allowed gifted environments to arise that could fully support cognitive development.[8]
Bootstrapping concerns the paradox that the best way for something to occur is for it to already to be established. This problem has been identified in computer and cognitive science as an important obstacle: computers need to load programs to start but this is best done when they have already loaded the program for doing this; reading is easier to acquire once a person can already read.[9] Cognitive development can be interpreted as the process by which cognitive systems sidestep and work around bootstrapping problems that would otherwise obstruct cognitive growth. The bootstrapping problem is proposed to explain why human cultural and technological developments often take so long to historically develop and then accelerate: the best circumstances for such innovations to flourish often arise only when they already exist.[10]
All animal species except humans live in much the same biological manner in which they evolved. Humans in contrast have journeyed away from being simple hunter-gatherers to becoming citizens of hi-tech nation states. Biologically this is odd since modern people still basically have the same genes as their early hunter-gatherers ancestors. This raises the question of what had evolved, the ticket, in those early humans that gave them to the potential to change later on so radically.[11]
The evolution of human intelligence is expressed in a Neural Plasticity + Prefrontal Cortex formula that is progressively elaborated:
NP + PC + ape mind = human mind[12]
NP + PC + fission-fusion ape social skills = human social symbols[13]
NP + PC + ape sensory and motor skills = human nonsocial symbols[13]
NP + PC + FF ape skills + symbols + 109 hours = contemporary mind[14]
NP + PC + mindware + braintech = future mind[15]
Symbols adapt already evolved functions to create novel ones by replacing their evolved inputs and outputs with nonevolved representations. Reading and writing are such new functions that rewire the functions of visual, speech and other cortical areas by letters and logogram stand-ins.[16]
Chemical catalysts work by creating chemical bonds by bringing existing substances into reaction using intermediaries, and by temporal and spatial conjunction. The prefrontal cortex works similarly upon information processing happening elsewhere in the brain through creating working memory space. This space allows novel intermediary forms of association to be created and held together between different information processing systems in the brain. This process is essential to the formation of symbols and symbol based cognition.[17]
Due to brain enlargement in humans, most of the human cerebral cortex lacks tightly evolved functions and so is open to acquire nonevolved skills. Even highly evolved cortical areas such as the primary visual and auditory cortices can to a surprising degree take on new functions. Semantics can develop in the visual cortex of those born blind,[18] and vision can develop in the auditory cortex in experimental animals when retinal input is redirected into it.[19] The association areas of the cerebral cortex lack the input constraints of primary areas. As a result, they are even more open to acquire novel cognitive capabilities.[20]
John Morton has proposed that memories are organized by headed records.[21] The function of the hippocampus is suggested to be providing such headers for memory. They also underlie the human capacity to experience in spite of superficial changes the continuity of self, other and place.[22]
Pain is argued to be a protective attentive envelope (see below) that temporary acts to protect injured or easily injured parts of the body from actions controlled by the brain.[23]
Aircraft have flight envelope protection systems that stop pilots acting in a manner that might harm the aircraft but which allow them to make quick but safe actions. The anterior cingulate cortex is argued to act as a “hidden observer” over what we do “attention-to-action” and it provides a similar function for humans. These envelopes underlie the experience of self-consciousness, anxiety and pain.[24]
Symbolons were ancient Greek tokens or insignia by which people who were bonded could spot each other (the word comes from the Greek “symballein” which means “to throw together”). The problem of social primates is to create bonds that are flexible yet also allow prolonged separation. Limbic symbolons are symbols that enable emotional attachments established in other apes by smell, grooming and to some degree sight, to cope with physical separation by an internal (mental name) or external (wedding ring) stand-in that is always cognitively present. Limbic symbols are usually publicly defined (another advantage) and acquired in rituals.[25] “Early hominid environments were dangerous and food resources patchy and irregular, which placed a premium on individuals able to exploit kin relations and extend social links beyond the immediate present. Such pressures promoted symbolism, originally to stand for kin recognition and social relationships, enabling these to be maintained over time and space even when the relevant individuals were absent. These developments in turn lead to more complex social networks and the cognitive abilities to exploit these.”[26]
Two kinds of sociability exist: immediate and nonimmediate. The former depends upon sensory interaction with others such as smell, touch, sound or vision. Nonimmediate depends upon carrying the experience of the group within the head. Such sociability is already present in apes and is due to processes called mindmakers.[27] But due to the modification of these mindmakers with symbolons, sociability in groups has become highly developed in humans. The combination of symbols and mindmakers created social mindware.[27]
These are “processes that weave this sense we all have of being a ‘me. .. give existence its animated feel, the feeling of being alive. They are clues to understanding such things as our freedom and the links between the prefrontal cortex’s inner cues and our hidden sociability’”.[28] Mindmakers evolved to enable animals to remain part of a social group when separated. Mindmaker processes are identified in the anterior cingulate cortex (protective attentive envelopes), hippocampus (continuity), orbitofrontal cortex (social right and wrong). Mindmakers are present in other animals but only in humans have they become extensively elaborated. They also provide the neural substrate for cultural symbolism and so the human ability to sustain socially defined groups and personal bonds.[29]
Mindware is the symbolic counterpart of mindmakers. The concept differs from that of memes in the way that the descriptive notion of a “bridge” differs from that of specified engineering types of bridges (suspension, cantilever, arch and so on). In the latter, what transmits is understood in terms of the specific engineering processes that support that transmission rather than the general idea of transmission.[30] The use of a wedding ring is a meme when viewed from the perspective of transmitted culture, but it is mindware when viewed from the neurological changes it makes to the attachment processes in the brain that sustain the emotional bond of marriage.[31] The acquisition of social mindware is closely linked with rituals.[32] In mindware “the human ape found a brain programming language to bond across time and place—symbolic culture. This was to change forever what it meant to be a brain. Now the human mind could live in thousands of varieties of life. …with their mindware humans set themselves apart from other animals and the rest of nature”.[33]
The subjective sense of embodiment in our extended physical body relates to its capacity to act through it and so interact with the autonomous physical world. The human brain also acts within the autonomous world of social relationships. This social embodiment gives rise to a sense of social “me” .[34] Consciousness is the embodied attention of the brain to its causality in such social relationships and the physical world.[35]
The sociability of social apes is fission-fusion. In this members of a group regularly separate into small subgroups (fission) but at the same time still belong to the same group (fusion). Human are unique in the robust ability of their bonds to survive prolonged physical separation. This is due to symbols. Another factor is that these bonds can be publicly defined and so create symbolic culture. This makes humans a superfission-fusion ape.[36] [37]
The Era that will follow the present one will be the Brain Age. In this neuroscience will replace the ancient myths that at present shape how people understand themselves. Further, braintech (see below) will arise that enables humans to reshape the competences of their brain. This Era will continue the reshaping of our species that has happened since its origins 120,000 years ago. Braintech represents the last frontier faced by the human species.[38]
Humans are social primates who use superficial differences (such as skin pigmentation) or symbols based upon ancient myth to identify their group membership. Brains offer a firmer foundation for our identity since they underlie the core of who we are in our shared “vulnerability, richness, history, and giftedness”.[15] Understanding this is our true nature. It follows that “Each of our brains should be guaranteed the right to grow unhandicapped and supplied with the best possible nurture and support”,[39] and “a gifted environment sensitive to its uniqueness”.[40]
Humans from early on when using stone tools have created technologies that have enhanced their abilities. This will continue with the still unexplored potential of the brain. One area is awareness of its hidden functioning as this is needed to better train it. The future of present functional imaging is proposed to be akin to that of computers as in the 1960s. Like such past computers such technology will spiral down in price and convenience so that this braintech (like computers today) will become an essential part of everyday human life.[41]