PSY402 Theories of Learning Chapter 4 (Cont.) Indirect Conditioning Applications of Conditioning.

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PSY402 Theories of Learning Chapter 4 (Cont.) Indirect Conditioning Applications of Conditioning

Extinction  Extinction – a method for eliminating a conditioned response.  Extinction paradigm: Present the CS alone (without the UCS).  With repeated exposure to the CS, it stops being a predictor of the UCS and the CR decreases and eventually stops.

What Influences Extinction?  The total duration of exposure to the CS alone, not the number of trials, determines how fast the CR is extinguished.  Shipley measured effects of tone- shock pairing on water licking. Suppression ratio for licking behavior 100 sec or 25 sec exposures to CS alone.

Total Duration Matters Most

Resistance to Extinction UCS followed CS on 50% of the learning trials

Spontaneous Recovery  Pavlov – extinction is caused by inhibition of the CR.  Spontaneous recovery occurs when inhibition is temporarily removed.  Continued experience of the CS without the UCS results in long- term suppression of the CR.

Conditioned Inhibition  CS+ the original CS  CS-a new CS similar to CS+  Presentation of CS- without the UCS inhibits the CR.  The idea is that CS- becomes associated with the absence of the UCS – it becomes an “all clear” cue. CS+ is associated with presence of the UCS.

Other Kinds of Inhibition  External inhibition – presence of a novel cue during conditioning inhibits the CR.  Latent inhibition (learned irrelevance) – not really inhibition. Preexposure to the CS (without the UCS) inhibits later conditioning (+ or -)  Inhibition of Delay – the CR is withheld until an appropriate time.

Latent Inhibition The more experience (acquisition trials), the closer the CR occurs to the onset of the UCS

Disinhibition  Disinhibition – removal of inhibition. The CR increases in strength.  Presentation of a novel stimulus during extinction interrupts it.  Example: Kimmel – disinhibition of inhibition of delay occurred with a novel stimulus. CR was withheld 4.0 secs but 2.3 secs with a novel stimulus

Higher-Order Conditioning  A new stimulus (CS 2 ) acquires the ability to produce a CR because it is paired with another CS (CS 1 ).  The CR to CS 2 is weaker than to CS 1 – 50% as strong.  Higher-order conditioning is difficult to accomplish because conditioned inhibition also arises. More pairings result in inhibition.

Higher Order Conditioning Two CS’s paired

Sensory Preconditioning  When two stimuli are associated with each other, if one becomes a CS, the other will become a CS too. Dog and neighbor example.  To get the strongest CR: Timing is important – first CS must precede second CS. Only a few CS-CS pairings to prevent learned irrelevance.

Sensory Preconditioning Two CS’s paired

Vicarious Conditioning  Berger – people hearing a tone and watching another person be shocked acquired a fear response.  Watching another person fail at a task can induce a stress response.  Monkeys can acquire vicarious fear responses to objects or snakes.  Arousal is needed for conditioning.