Chap+52+Behavioral+Biology

Chap+52+Behavioral+Biology - Chapter 52 Behavioral Biology...

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Chapter 52 Behavioral Biology Innate behavior Learning and cognition Behavior and Communication Evolution shapes behavior Social Behavior
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Behavior: How an animal responds to environmental stimuli Approaches to behavior science Proximate causation (How?): physiological basis (hormones, genes, etc) Ultimate causation (Why?): adaptive value to reproductive success. Some behavior is innate (instinctive, “hardwired”) Innate Egg Rolling Response in Geese Sign (Key) stimulus Innate releasing mechanism Fixed action patterns
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Behavior and Genetics: Nature vs. Nurture Controversy Some behavior is inherited (nature) Robert Tyron bred “maze-bright” and “maze- dull” mice based on their ability to negotiate a maze. Ability to perform other behavioral tasks were unaffected Also: Lovebird nesting and identical twin studies among humans
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Behavior and Genetics: Single Gene effects on behavior Mutations causing behavioral abnormalities have been isolated in mice and Drosophila (fruit flies), e.g. ., memory gene in mice encodes α-calcium-calmodulin-dependent kinase II (found in hippocampus). Nurturing response: fosB mutant mice do not show nurturing In WT, FOSB is activated in the hypothalamus in response to babies, causing other enzymes to be activated, changing the brains circuitry to promote maternal behavior.
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Behavior is not only genetic – influenced by learning (nuture) Learning: altered behavior based on previous experience Nonassociative learning: no association between two stimuli Habituation – learning not to respond to repetitive stimuli Associative learning:
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This note was uploaded on 09/16/2008 for the course BIOL 1720 taught by Professor Jagadeeswaran during the Spring '08 term at North Texas.

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Chap+52+Behavioral+Biology - Chapter 52 Behavioral Biology...

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