Lecture 5 - ClassConMechs

Lecture 5 - ClassConMechs - Classical Conditioning:...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Classical Conditioning: Mechanisms I. Beyond the basic CS­US relationship A. Stimulus generalization – how well does a stimulus similar to the CS elicit a CR? Examples? B. Second­order conditioning – a stimulus that predicts the CS comes to elicit a CR Light Food; Light = Excitement Tone Light ; Tone = Excitement Examples? II. Effective CS’s and US’s Novelty ­ CS­ and US­preexposure effects – prior exposure decreases response B. Intensity and Salience – more intense CS/US = more intense CR/UR C. Belongingness D. Biological Strength A. III. Nature of the CR A. ­ ­ Stimulus substitution – the CS­US association turns the CS into a substitute US – thus US determines CR CS activates neural circuits previously activated by the US and thus elicits responses similar to the US CS US circuits UR ­ Jenkins & Moore (1973) – Pigeons had different CR’s depending on whether US was food or water But, CR is not always same as UR! III. Cont. CS Determines Form of CR ­ Timberlake & Grant (1975) – a rat was used as a CS to predict food for another hungry rat If stimulus­substitution was always correct, what CR would it predict? A. III. Cont. A. Behavior Systems ­ Presentation of a US activates the behavior system relevant to that US ­ Female sexual behavior system (courtship, mounting, copulation) ­ Food feeding behavior system (foraging, salivation, chewing, swallowing) III. Cont. Thus, a CS will activate behaviors relevant to that system CS­US interval can affect CR CS­US Interval CR 1 min Male approached CS and stayed near it 20 min Male moved around entire cage more III. cont General Search Focal Search Consummatory Behaviors ...
View Full Document

Ask a homework question - tutors are online