37986Re: [evol-psych] Re: Re: IQ tests
- Sep 2, 2005It is possible that the "radical change in their environment" associated
with the three-fold increase in brain size for hominins may have involved
different specific factors than that associated with the relatively small
differences in brain size in birds. IMO we could be looking at apples and
oranges here. Different parts of the brain are used for different cognitive
processes. Hominin brains are especially enlarged or changed in those areas
associated with social competencies (Adolphs, 2003; Geary 2005). However,
brain evolution in some species of birds also may have as much to do with
the dynamics of social competition as with physical aspects of the
environment (Emery & Clayton 2004; Rothe & Dicke 2005).
In regard to the other string on body size and brain size, there are
constraints from flying that make such assessments more difficult for birds.
An additional factor to consider is the different levels of social
competition that are contingent upon ecological dominance (Ward et al 2004).
Adolphs, R. (2003). Cognitive neuroscience of human social behavior. Nature
Reviews, Neuroscience, 4(3), 165-178.
Emery, N.J. & Clayton, N.S. (2004). The mentality of crows: convergent
evolution of intelligence in corvids and apes. Science 306, 1903-1907.
Flinn, M.V., Geary, D.C., & Ward, C.V. (2005). Ecological dominance, social
competition, and coalitionary arms races: Why humans evolved extraordinary
intelligence. Evolution and Human Behavior, 26(1), 10-46.
Flinn, M.V., Alexander, R.D., & Coe, K. (200x). Runaway social selection:
The linked red queens of human cognition, coalitions, and culture. In
The evolution of mind, S.W. Gangestad & J.A. Simpson (Eds.), New York:
Geary, D. C. (2005). The origin of mind: Evolution of brain, cognition, and
general intelligence. Washington: American Psychological Association.
Roth, G. & Dicke, U (2005). Evolution of the brain and intelligence. TRENDS
in Cognitive Sciences, 9(5), 250-257.
Ward, C.V., Flinn, M.V., & Begun, D. (2004). Body size and intelligence in
hominoid evolution. In: The evolution of thought: Evolutionary origins of
great ape intelligence, A.E. Russon & D.R. Begun (Eds.), pp. 335-349.
Cambridge: Cambridge University Press.
On 9/2/05 10:06 AM, "Elaine Morgan" <elaine@...> wrote:
> ----- Original Message -----
> From: "Jason Malloy" <jmalloy@...>
> To: <email@example.com>
> Sent: Thursday, September 01, 2005 4:19 PM
> Subject: [evol-psych] Re: Re: IQ tests
> "Overall, our results provide strong evidence for the hypothesis
> that enlarged brains function, and hence may have evolved, to
> deal with changes in the environment," they wrote in this week's
> issue of the Proceedings of the National Academy of Sciences.
> This I like. It suggests that our ancestors - compared to those of the
> chimpanzees -
> were subjected to a much more radical change in their environment.
> Not long ago we learned that bipedalism arose
> before the savannah ecosystem existed, so the radical change to
> life on the plains cannot have been responsible.
> Some other radical change must have happened to them, no? Can anybody
> recommend any
> peer-reviewed papers suggesting what it may have been?
> Yahoo! Groups Links
Departments of Anthropology
and Psychological Sciences
University of Missouri
Columbia, MO 65211
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