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Quick learning 59
Positive and negative reinforcement 61
Operant-respondent overlap 62
The importance of operant conditioning 64
4. EXTINCTION AND RECONDITIONING 67
The adaptability of behavior 67
Respondent extinction 68
Spontaneous recovery 70
Operant extinction 70
Resistance to extinction as a measure of strength 72
When is a response extinguished? 76
Spontaneous recovery of a Type R response 76
Extinction and forgetting 78
Regression: a by-product of extinction 81
One-trial extinction 82
Periodic reconditioning 83
P-R at fixed intervals 83
Response rate and P-R interval 88
Extinction after periodic reconditioning 89
Fixed-ratio periodic reconditioning 91
The 'ceiling' of fixed-ratio responding 94
Extinction following fixed-ratio reinforcement 97
The effect of aperiodic reinforcement 98
Superstition: an experimental example 102
Punishment and extinction 104
5 GENERALIZATION AND DISCRIMINATION 115
Stimulus generalization 115
Stimulus discrimination 116
Forming a respondent discrimination 117
Generalization and discrimination in operant
conditioning: the 'discriminative stimulus 		118
The effect of previous training 120
A human discrimination analyzed 121
Abolishing a discrimination 122
Extinguishing a discriminative operant 123
The meaning of "similarity" 123
Generalization gradients 126

-xii-

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Publication Information: Book Title: Principles of Psychology: A Systematic Text in the Science of Behavior. Contributors: Fred S. Keller - author, William N. Schoenfeld - author. Publisher: Appleton-Century-Crofts. Place of Publication: New York. Publication Year: 1950. Page Number: xii.
    
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