Exocortex

An exocortex (speculative) is an external information processing system that augments, in a subtle and seamless fashion via a brain-computer interface, the brain's biological high-level cognitive processes.

An individual's exocortex would be comprised of all the external memory modules, processors, IO devicesand software systemsthat the person's biological brainrichly interacts with in real-time such that these extensions are functionally part of the individual's mind. Individuals with significant exocortices can be classified as transhumanbeings.

Etymology

The noun exocortex is composed of two morphemesof latin origin: the prefix exo-? meaning external or outside ? and the root noun cortex? originally meaning bark, but in context of the neuroscience refers to the outer bark-like layer of the brainthat is the site of most sophisticated cognitive information processing. Thus based on its component morphology, the term exocortex refers to a region external to the brain's cortex.

Furthermore, the term exocortex is an allusionto the term neocortex, the neuroanatomical region that many believe is responsible for the highest human cognitive abilities including conscious thought, spatial reasoning, and sensory perception. The neocortex, literally the "new cortex", is the most recent region of the cortex to develop according to evolutionary neuroscientists. Through this allusion, the term exocortex invokes a similar association with high-level human or even supra-human cognitive processing capabilities.

Intellectual Background

The concept of an exocortex has intellectual roots both in the fields of computer scienceand evolutionary psychology.

Computer Science Roots

Within computer science, the seeds were planted by the DARPAassociated researcher J.C.R. Licklider. Within his speculative 1960 paper Man-Computer Symbiosis, Licklider outlined his vision that humans and the new technology of computers, if tightly-coupledtogether, would prove to compliment each others strengths to such a degree that many of the pure artificial intelligencesystems envisioned at the time by (over-)optimistic researchers would prove unnecessary:

"Man-computer symbiosis is a subclass of man-machine systems. There are many man-machine systems. At present, however, there are no man-computer symbioses. The purposes of this paper are to present the concept and, hopefully, to foster the development of man-computer symbiosis by analyzing some problems of interaction between men and computing machines, calling attention to applicable principles of man-machine engineering, and pointing out a few questions to which research answers are needed. The hope is that, in not too many years, human brains and computing machines will be coupled together very tightly, and that the resulting partnership will think as no human brain has ever thought and process data in a way not approached by the information-handling machines we know today."

? Man-Computer Symbiosis, J.C.R. Licklider, March 1960.

A DARPA contemporary of Licklider, Douglas Engelbart, was thinking along similar lines in the field of computer science. In 1962, Engelbart authored Augmenting Human Intellect in which he details how to augment human intellectual effectiveness by exploiting the technology of the then emerging computer:

"This is an initial summary report of a project taking a new and systematic approach to improving the intellectual effectiveness of the individual human being. A detailed conceptual framework explores the nature of the system composed of the individual and the tools, concepts, and methods that match his basic capabilities to his problems. One of the tools that shows the greatest immediate promise is the computer, when it can be harnessed for direct on-line assistance, integrated with new concepts and methods."

? Augmenting Human Intellect: A Conceptual Framework, Douglas Engelbart, October 1962.

From this basis, the concept of an exocortex, the direct coupling of the human mind with computers to leverage their respective complimentary strengths, can be viewed as a result of the ever increasing symbiotic coupling between human and computers.

Psychology Roots

The exocortex concept also has roots in evolutionary psychologyas a result of Merlin Donaldof Queen's University. Donald, in the 1990 book Origins of the Modern Mind as well as later papers, proposed an evolutionary model of the mind, from a functionary perspective, from its origins in prehistoric apes to the modern human being. Donald focuses significant attention on the use that modern humans make of external symbolic storage and manipulation systems -- the range of technologies from cuneiforms, hieroglyphics, and ideogramsto alphabetic languages, mathematicsand now computers. From Donald's perspective, these external symbolic systems have allowed for the functional reorganization of the human mind in how it deals with the world.

"The externalization of memory [via the use of external symbolic storage systems] has altered the actual memory architecture within which humans think, which is changing the role of biological memory, the way in which the human brain deploys its resources, and the form of modern culture."

? Precis of Origins of the modern mind, Merlin Donald, 1996.

Thus to Donald, the human mind has long been a hybrid struture built from the vestiges of earlier biological stages and combined with our new external symbolic systems. The development of an exocortex, which could result in significant functional reallocation, again fits well within this long established trend.

Current Applicability

Cognitive Science Origin

In November1998the specific term exocortex was coined by researcher Ben Houston. Houston coined the term to refer concisely to tightly-coupledcognition-level brain-computer interfacetechnologies in the spirit of Licklider's and Engelbart's original visions.

"exocortex (eks'o kor'teks) n. Latin -- an organ that resides outside of the brain that aids in high level thinking. .... This will not be a prominent term until prefrontal cortex neural implants become widespread." (emphasis in original)

? early exocortex definition, Ben Houston, May 2000 [1].

Use in Science Fiction

Speculative devices which could have otherwise been labeled as exocortices were described in some areas of 1980 and 1990 hard science fiction. One prominent example would be William Ford Gibson's novel Neuromancer. More recently, Vernor Vinge, in A Fire Upon the Deep and several short stories, described the functional effects of what are essentially several kinds of exocortices - both those composed of computational elements, and those enabled by high-bandwidth communication between groups of beings.

Charles Stross, the Hugo Award-nominated hard science fictionwriter, has led the adoption of the term exocortex within science fiction circles. Beginning in 2004, Stross made use of the term in Elector, a short story published in the September issue of Asimov's Science Fiction. Stross made more extensive uses the term exocortex and its derivatives in Accelerando, his 2005 novel.

While Stross himself does not provide an explicit definition of the term, a few passages indicate his meaning:

"About ten billion humans are alive in the solar system, each mind surrounded by an exocortex of distributed agents, threads of personality spun right out of their heads to run on the clouds of utility fog ? infinitely flexible computing resources as thin as aerogel ? in which they live." (emphasis added)

? Accelerando, Charles Stross, 2005.

"Sometimes he isn't certain he's still human; too many threads of his consciousness seem to live outside his head, reporting back whenever they find something interesting. .... And it's too early for anyone out there to be trying to hack exocortices... isn't it? Right now, the external threads of his consciousness are telling him that they like Annette...." (emphasis added)

? Accelerando, Charles Stross, 2005.

The Wikibooks Accelerando Technical Companionprovides this explanation:

"An EXOcortex can best be described as the portion of a trans- or posthuman entity's brain (or cortex) which exists outside of that entity's primary computing structure, usually the brain inhabiting a person's 'meatbody.' For example, a person's exocortex could very well be composed of all the external memory modules, processor, and devices that the person's biological brain interacts with on a realtime basis, thereby in effect making those external devices a functional part of the individual's 'mind.'" (emphasis in original)

? Accelerando Technical Companion, Wikibooks.

Popular Usage

While initial recognition of the exocortex concept was nonexistent, this has changed as a result of Charles Stross's recent publications and the growing awareness of brain-computer interfacing. The term and concept of an exocortex has both been applied (ie. "Suffered a Stroke in my Exocortex") and noted as a novel interesting word (ie. "Found Words: Exocortex") by various bloggers. Here are some additional examples of proper contextual usage: [2], [3], and [4].

Future Prospects

If one widens the definition of an exocortex, one can see that computational elements are already used as supporting elements of biological brains, and growing dependence on parts of the Internetthat serve cognitive functions has brought what could be considered a proto-exocortex into existence. Wikipediaitself is an example, as technological interfaces enable inter-brain co-operation on high-level cognitive tasks. The fulfillment of the initial vision of Licklider and Engelbart suggests that continued development along this path is likely.

Currently, true exocortices remain speculative. The main issue is that the required underlying technology is yet to be produced by the scientific research fields of (1) cognitive neuroscience, (2) computational neuroscienceand (3) neural engineering. Once exocortices become technically feasible and proven safe, some societial resistance may be encountered if establishing the brain-computer interface requires procedures that are more than minimally invasive.

External links

• Man-Computer Symbiosis paper, JCR Licklider, March 1960.
• Augmenting Human Intellect paper, Douglas Engelbart, October 1962.
• Origins of the Modern Mind book, Merlin Donald, 1990, ISBN 0674644840.
• Exocortex definition, Ben Houston, May 2000.
• Elector short story, Charles Stross, 2004.
• Accelerando novel, Charles Stross, 2005, ISBN 0441012841.
• Accelerando Technical Companion, WikiBooks, 2005.
• Found Words: ExocortexFalse Positives blog posting, Ian Irving, July 2005.

See also

• Cognitive Science: cognition, cognitive neuroscience, consciousness, mind
• Cybernetics: cyberware, cyborgs in fiction, cyborg, transhumanism
• Neuroscience: brain, brain-computer interface, computational neuroscience, cortex, neocortex, neural engineering
• People: Merlin Donald, Douglas Englebart, J.C.R. Licklider, Charles Stross, Vernor Vinge

This article is licensed under the GNU Free Documentation License.
It uses material from the http://en.wikipedia.org/wiki/Exocortex Wikipedia article Exocortex.