PSY402 Theories of Learning Friday January 24, 2003.

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Presentation transcript:

PSY402 Theories of Learning Friday January 24, 2003

Applications of Conditioning  Treatment of phobias Systematic desensitization  Treatment of addictions Elimination of conditioned withdrawal reactions  Enhancement of drugs used to treat immune system disorders Lupus, AIDS

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.

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

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.  Virtual reality also used to treat addictions.

Treatment of Immune Disorders  Lupus, AIDS are immune system disorders. Treated using drugs that either boost or suppress immune system response.  Classical conditioning can be used to produce the results of such drugs without the side effects or cost.

Immune System Conditioning  Cyclophosphamide used to induce nausea during flavor-aversion learning also immunosuppressant. The saccharin-flavored water used as a CS caused several rats to die.  The drug reaction occurred without the drug – the CS evoked immune system suppression.  Also works with other drugs.

Treatment of Lupus & AIDS  Rats given saccharin paired with cyclophosphamide had slower lupus progression and lower mortality.  A girl treated for lupus was able to use half as much drug when paired with a distinctive taste and smell.  Sherbet paired with adrenaline enhances immune functioning for AIDS treatment.