Overlearning and brightness-discrimination reversal.

1965 ◽  
Vol 69 (4) ◽  
pp. 375-381 ◽  
Author(s):  
M. R. D'Amato ◽  
Donald Schiff
Keyword(s):  
Brightness Discrimination ◽  
Discrimination Reversal

Effects of Novel Irrelevant Cues on Brightness Discrimination Reversal in Rats

1975 ◽  
Vol 37 (3_suppl) ◽  
pp. 1223-1226
Author(s):  
Frank Hartel ◽  
Marilyn Hafer
Keyword(s):  
Irrelevant Dimension ◽  
Brightness Discrimination ◽  
Discrimination Reversal ◽  
The Novel ◽  
Facilitative Effect

Rats learned a brightness discrimination with irrelevant form cues present. Following overtraining, reinforcement contingencies were successively reversed with respect to brightness cues. Novel form cues were introduced at the first reversal and at each of two successive reversals for 20 rats; 20 experienced the same form cues throughout. The novel-cue group required significantly fewer trials to criterion than the same-cue group, over all phases. Implications of the facilitative effect of novelty along an irrelevant dimension are discussed.

Effects of Overlearning and Spatial Delay of Reinforcement upon a Discrimination Reversal

1965 ◽  
Vol 16 (1) ◽  
pp. 79-83 ◽  
Author(s):  
Coleman Paul ◽  
Joan Havlena
Keyword(s):  
Discrimination Task ◽  
Original Learning ◽  
Brightness Discrimination ◽  
Positive Stimulus ◽  
Discrimination Reversal ◽  
Reversal Training ◽  
Delay Of Reinforcement ◽  
Brightness Discrimination Task

Rats were trained on a brightness discrimination task under two conditions of spatial delay of reinforcement. Groups received either 0 or 150 postcriterial trials and then were given reversal training. Reversal training was under either the same delay as experienced in original learning or the alternate one. The results indicated that the delay variable, ineffective in original learning, affected reversal acquisition. The postcriterial trials had no affect on trials to reversal criterion. Further analysis indicated that overtraining resulted in a greater number of initial responses to the originally positive stimulus early in reversal training.

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