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Lecture 5

Lecture 5- September 20th.docx

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University of Guelph
PSYC 2330
Francesco Leri

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 Is it really S-S* learinS-R learning – associative learning between CS & UR; CS becomes an S*, gaining its own biological significance after conditioning Pseudo-conditioning o Possibility that, once conditioned, exposure to CS activates ‘CS-centre’ which contacts the ‘Response Center’ directly (rather than the ‘US- Increased responding to the CS that might occur because of mere exposure to the US o Classical/Pavlonian learning – link/associations learned between US and CS (S-S*)  CS  ‘CS-centre’  ‘US-centre’  ‘Response-centre’  Response Sensitization to the CS S-R learning 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 CS did not produce a CR  habituation/  no fear b/c fear- devaluation 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  CS did not produce a CR Taste aversion  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 1 -order CS and US o 2 -order CS elicits CR b/c of predictive value for 1 -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  CS2 is never paired with UR; association learned b/w CS1 and CS2 (in pre-conditioning trial) causes presentation of CS2 to elicit a CR that is developed from the CS1’s subsequent association with US Conditioning Preparations: 1. Eye blink conditioning  ie. in rabbits, have reliable/well-characterizing blinking reflex  Simple conditioning prep where presentation is sequential (US  CS  US  CS, etc…)  Response to US (UR) is identical to CR that occurs after conditioning  Eg. US = puff of air to the eye UR= eye blink CS= tone CR= eye blink 2. Fear conditioning  quantified through Skin Conductance Response (SCR) which is a physiological measure for fear  UR is a reflexive response while CR can consist of autonomic (involuntary, eg. SCR) and somatic activity (voluntary move
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