Discrimination and Extinction as a Function of Internal and External Discriminanda

1973 ◽  
Vol 33 (1) ◽  
pp. 251-254
Author(s):  
Patrick E. Campbell ◽  
Charles M. Crumbaugh ◽  
Robert R. McLeroy ◽  
Edward Framer
Keyword(s):  
Discrimination Learning ◽  
Discrimination Problem ◽  
Successive Discrimination ◽  
Extinction Phase ◽  
External Cues

32 rats were trained on a successive discrimination problem for 40 days. 4 separate groups received the factorial combinations of presence vs absence of internal (aftereffects) or external (alley color) discriminanda. Discrimination learning was quite apparent in the rats with external cues but failed to develop in the rats trained only with internal cues. During an extinction phase the rats trained with only internal cues proved to be more persistent. These results were related to an earlier experiment suggesting the superiority of internal cues.

Effect of Reinforcement of the Negative Discriminandum in Differential Conditioning

1964 ◽  
Vol 14 (1) ◽  
pp. 107-110 ◽  
Author(s):  
Peter J. Donovick ◽  
Leonard E. Ross
Keyword(s):  
Phase I ◽  
Discrimination Learning ◽  
Differential Conditioning ◽  
Discrimination Problem ◽  
Single Stimulus ◽  
Female Rats ◽  
Second Phase ◽  
Learning Situation ◽  
Learning Conditions ◽  
The Difference

The present investigation was concerned with the reduction of inhibition associated with the negative discriminandum in a single stimulus discrimination learning situation. In Phase I 33 female rats were trained on a black-white discrimination problem. In the second phase Ss were divided into three groups which received: (a) 100% reinforcement to both the old positive and negative discriminanda; (b) four trials per day to the old negative, 100% reward; (c) eight trials per day to the old negative, 100% reward. As in previous studies, which employed simultaneous discrimination learning conditions, speed to the old negative remained significantly below speed to the old positive in the second phase. However, unlike the previous results, the difference decreased over trials. No differences were found between the groups that had trials to the old negative cue only, or between these groups and either speed to the old positive or the old negative in the case of the group receiving reward on both cues.

Retention of a Successive Discrimination Problem by Hippocampectomized and Neodecorticate Rats

1966 ◽  
Vol 19 (3) ◽  
pp. 991-1002 ◽  
Author(s):  
Robert L. Isaacson ◽  
Leonard W. Schmaltz ◽  
Robert J. Douglas
Keyword(s):  
Discrimination Problem ◽  
Successive Discrimination

An experiment and its replication are reported in which the postoperative retention of a successive discrimination problem was studied following destruction of the hippocampus and overlying cortex or of the neocortical areas only. Animals with lesions of the posterolateral neocortex showed severe deficits in performance of the problem. Hippocampectomized Ss were also impaired but their deficit was marked by consistent responding to one arm of the maze, i.e., response fixation.

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