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Lecture 5

PSYC 2330 Lecture Notes - Lecture 5: Contiguity, Ice Cream Van, Conditioned Place Preference


Department
Psychology
Course Code
PSYC 2330
Professor
Francesco Leri
Lecture
5

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PSYC*2330 Week 3
September 20, 2012
Is it really S-S* Learning?
S: neutral stimulus (CS) that becomes predictor of S*
S*: biologically significant stimulus (US)
Pseudo-conditioning increased responding to the CS that might occur
because of mere exposure to the US
o Conditioning did not actually supply the CS with predictive value, just
appears this way
Sensitization to the CS response isn’t due to predictive value of CS, just
due to the new value the CS now has due to repeated exposure
S-R learning associative learning between CS & UR; CS becomes an S*,
gaining its own biological significance after conditioning
o Possibility that, once conditioned, exposure to CS activates ‘CS-centre’
which contacts the ‘Response Center’ directly (rather than the ‘US-
centre’ as an intermediate)
o Classical/Pavlonian learning link/associations learned between
US and CS (S-S*)
CS ‘CS-centre’ ‘US-centre’ ‘Response-centre’
Response
Is it really S-S* learning?
Pseudo-conditioning
Increased responding to the CS that might occur because of mere
exposure to the US
Sensitization to the CS
S-R learning

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1) POST-CONDITIONING DEVALUATION (US DEVALUATION)
*CS stops producing a CR because the US that it was predictive of is no longer valuable
Rescorla (1973): light (CS) conditioned with a loud noise (US)
PHASE 1:
PHASE 2:
TEST:
1. CS-US
CS produced a CR fear
2. CS-US
Exposure to US
habituation/
devaluation
CS did not produce a CR
no fear b/c fear-
inducing US (noise) has
been devalued
Holland and Straub (1979): noise (CS) conditioned with food (US)
PHASE 1:
PHASE 2:
TEST:
1. CS-US
CS produced a CR
salivation
2. CS-US
US & Sickness
Taste aversion
CS did not produce a CR
taste aversion devalues
CS
*Both indicate S-S associative learning one stimulus becomes a learned predictor of
the other
2) CS-CS ASSOCIATIONS:
Second order Conditioning
demonstrative of indirect associative S-S
learning
o First-order CS (tone) is paired with US in first-order conditioning
such that the tone now induces salivation (CR)
o Second-order CS (light) is paired with first-order CS (tone) in second-
order conditioning now light induces the CR created from the
learned association between 1st-order CS and US
o 2nd-order CS elicits CR b/c of predictive value for 1st-order CS which is
predictive of biologically significant US
Sensory Predonditioning preconditioning trial between 2 CS’s (eg.
CS1=Tone & CS2=Light)
o Then CS1 is paired with a US (Food) such that a CR is developed
(salivation)
o CS2 (Light) also induces salivation (CR) despite never being directly
conditioned as a US predictor
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