Phys A L15

Phys A L15 - 11/16/07 Physical Anthropology: Lecture 15 I....

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11/16/07 Physical Anthropology: Lecture 15 I. Why Do Brains Exist? A. Distribution of resources necessary for survival and hazards that threaten survival vary in space and time B. Little need in immovable, predictable environment C. Brains informed by senses about presence resources and hazards, evaluate, store input and generate adaptive responses executed by muscles D. Thus when, 1. Resources rare, distribution variable 2. High energy requirements, continuously sustained 3. Survive for long periods of time before reproducing E. Furthermore, brains are full and complex II. How Do You Evolve Big Brains? A. Animals with big brains are rare. Why do so few have large brains? B. Reason: brains are expensive! (energy, time, and complexity) C. Costs 1. Large brains take a long time to mature consequently large brained animals are dependent on parents for a long time 2. Slow development of large brained offspring—reduce reproductive potential parents—extra special care ensure reproductive age
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This note was uploaded on 04/08/2008 for the course ANTH 5 taught by Professor Gaulin during the Fall '07 term at UCSB.

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Phys A L15 - 11/16/07 Physical Anthropology: Lecture 15 I....

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