Chapter 6 Part 3 - Learning (part 3) Today's topics...

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Today’s topics Biological Influences on Learning Neural Basis for Learning Learning (part 3)
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Biological Influences on Learning: Belongingness Chapter 6: Varieties of Learning An animal’s ability to form associations seems to be constrained by its biology A particular species seems predisposed to learn associations that give it a better chance for survival Belongingness – the idea that, for any particular species, some stimuli seem to “belong” together and some do not
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Taste-Aversion Learning Chapter 6: Varieties of Learning • Rats given access to a drinking tube • When rats licked tube they received water plus flavor stimulus added to water and noise-light stimulus • As rats licked tube: • One group received X-rays which made them ill 30 minutes later • One group was shocked Test phase • rats (both groups) given access to water that was either: (1) flavored, or (2) unflavored but accompanied by noise-light stimulus
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Chapter 6: Varieties of Learning RESULTS : • X-ray group avoided flavored water, but drank plain water accompanied by noise-light stimulus ( conditioned taste aversion ) • Shock group drank flavored water, but avoided water accompanied by noise-light stimulus • What didn’t happen: • X-ray group formed no association between nausea and noise- light stimulus • shocked group formed no association between flavor and shock • These results led to the concept of preparedness – a biological predisposition to associate certain NS-US combinations
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Preparedness Chapter 6: Varieties of Learning Rats are biologically “prepared” to associate taste with sickness • This is very important to a rat If a rat eats enough poisoned bait that it gets sick but lives , it will learn to avoid any bait with same taste ( bait shyness ) Makes sense from evolutionary point of view • rats eat at night • rats have poor vision difficult to associate what bait looks like with later sickness • well prepared to associate smell or taste with sickness (highly developed chemical senses) Quail (highly developed vision) are biologically “prepared” to associate sight of food with sickness • relies heavily on vision
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Chapter 6 Part 3 - Learning (part 3) Today's topics...

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