Wednesday, October 21, 2009

Recapitulation vs. Neoteny


Gould makes an explicit comparison between the two developmental theories on p. 148 of The Mismeasure. Here is the relevant quote...


"Recapitulation required that adult traits of ancestors develop more rapidly in descendants to become juvenile features - hence, traits of modern children are primitive characters of ancestral adults. But suppose that the reverse process occurs as it often does in evolution. Suppose that juvenile traits of ancestors develop so slowly in descendants that they become adult features. This phenomenon of retarded development is common in nature; it is called neoteny (literally, "holding on to youth"). Bolk argued that humans are essentially neotenous. He listed an impressive set of features shared by adult humans and fetal or juvenile apes, but lost in adult apes: vaulted cranium and large brain in relation to body size; small face; hair confined largely to head, armpits and pubic regions; unrotated big toe. I have already discussed one of the most important signs of human neoteny in another context (pp. 132-135): retention of the foramen magnum in its fetal position, under the skull"


So Gould is clearly a supporter of the significance of neoteny in human evolution (see his Ontogeny and Phylogeny (Gould, 1977) for his most complete discussion of this issue).


He then goes on to spell out the meaning of these two theories for ranking of human races.


"Now, consider the implications of neoteny for the ranking of human groups. Under recapitulation, adults of inferior races are like children of superior races. But neoteny reverses the argument. In the context of neoteny, it is "good" - that is, advanced or superior - to retain the traits of childhood, to develop more slowly. Thus, superior groups retain their childlike characters as adults, while inferior groups pass through the higher phase of childhood and then degenerate toward apishness. Now consider the conventional prejudice of white scientists: whites are superior, blacks inferior,. Under recapitulation, black adults sould be like white children. But under neoteny, white adults shold be like black children."


Which chimpanzee looks more advanced (i.e., more similar to humans), the juvenile or the adult, and which theory does this support?




1 comment:

  1. I would say that we look more like the baby chimp (flat facial features and upright posture) than the adult. The neotany theory supports this as it clarifies “juvenile traits of ancestors develop so slowly in descendants that they become adult features.”

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