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.

Inhibition of Delay 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. Do 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.

Applications of Conditioning Treatment of phobias Systematic desensitization Treatment of addictions Elimination of conditioned withdrawal reactions

How a Phobia Works A phobia is an unrealistic fear. A learning experience causes fear to become associated with a neutral stimulus. Avoidance prevents extinction. The stimulus is generalized. Eventually, too many experiences must be avoided and a person s functioning is impaired.

Systematic Desensitization Wolpe applied ideas from classical conditioning to treatment of phobia. Reciprocal inhibition an organism can only feel one emotion at a time. Mary Cover Jones used counterconditioning to extinguish fear. Cats could be counterconditioned using food.

Clinical Procedure Construct an anxiety hierarchy. Teach a relaxation response. Cue-controlled relaxation. Counterconditioning pairing of relaxation with imagined feared stimuli, starting with least scary. Assessment of whether the treatment worked interacting with the feared stimulus.

Sample Thematic Hierarchy

Effectiveness of Desensitization Wolpe reported 90% success rate, compared to 60% for psychoanalysis. 12-29 sessions Relapse after 1-3 yrs easily treated. Works with a wide range of fears. Can also be used with anxiety disorders.

Sample Spatial-Temporal Hierarchy

Limitations on Desensitization The client must be able to vividly imagine the feared stimulus. 10% cannot do this. Confrontation of a real rather than an imagined object is more effective. Difficult for the client to endure the anxiety associated with this.

Virtual Reality Desensitization Graded height-related stimuli presented via virtual reality were effective in treating acrophobia. Subjects were able to endure real stimuli after virtual treatment. Successful in treating spider phobia.

Treatment of Withdrawal Conditioned withdrawal reaction environmental cues become associated with withdrawal stage. Exposure to cues triggers symptoms. Withdrawal motivates substance use. Extinction by exposure to environmental cues is needed, especially to avoid spontaneous recovery. Non-drug cues can be used to avoid relapse.

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