Primate Evolution

Primate card evolution has been a topic of broad controversy in the past twenty years, especially since the takings of Jerisons Evolution of the Brain and Intelligence (1973). Since that time, research has been directed at uncovering the selection pressures that led to increases in primate hit coat. The two main hypotheses advanced to answer the question of why encephalization has occurred focus on foraging strategies and social intelligence (e.g. Clutton-Brock and Harvey 1980, Byrne and whitewash 1988). The two are not necessarily exclusive, but twain claim dominion over the arrow of causality. Doubtless no one factor led exclusively to larger brains. Dunbar try to integrate the ecological and the social arguments in a scheme about the evolution of group size (1993), and Sawaguchi (1992) proposed a paradigmatic synthesis in his notion that brain evolution has proceeded on multiple, parallel paths, but the interaction between various socio-ecological factors has barely to be determined.
This interaction has tremendous implications for research because it cannot be disencumber after the relationships between brain changes and the factors have been set.
Metabolic charm
Another camp contends that brain size racing shells not to 2/3 but to 0.



75 which is the allometric exponent for basal metabolous rate determined by Kleiber (1961 in Martin 1981). Consequently, Martin proposes that the brain size scales to metabolic rate.[6] Since post-natal growth of the brain is limited to expansion of preexistent neurons and glial cells, Martin claims that brain size of an animal does not scale directly with an individuals metabolic rate but rather varies allometrically with its mothers metabolic rate, and indeed, neonatal brain size strongly correlates with adult brain size suggesting that brain development is limited by pre-natal factors (Martin 1981, Pagel and Harvey 1988).[7] Martins possibleness clearly implies that the more energy an animal can arrange in...If you want to get a full essay, order it on our website: Orderessay



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