Overshadowing and blocking between landmark learning and shape learning: the importance of sex differences |
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| Authors: | Rodríguez Clara A Chamizo V D Mackintosh N J |
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| Institution: | (1) Departament de Psicologia B?sica, Facultat de Psicologia, Institute for Brain, Cognition and Behavior (IR3C), Universitat de Barcelona, Passeig de la Vall d’Hebron 171, Barcelona, 08035, Spain;(2) Department of Experimental Psychology, University of Cambridge, Cambridge, UK |
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| Abstract: | Rats were trained in a triangular-shaped pool to find a hidden platform that maintained a constant relationship with two sources
of information, an individual landmark and one part of the pool with a distinctive shape. In Experiment 1, shape learning overshadowed landmark learning but landmark learning did not overshadow shape learning in males, while landmark
learning overshadowed shape learning but shape learning did not overshadow landmark learning in females. In Experiment 2,
rats were pretrained either with the single landmark relevant or with the shape relevant, in the absence of the alternative
cue. Final test trials, without the platform, revealed reciprocal blocking only in females; in males, shape learning blocked
landmark learning, but not viceversa (Experiment 2a). In Experiment 2b, male rats received a longer pretraining with the single landmark relevant, and now landmark learning blocked shape learning.
The results thus confirm the claim that males and females partially use different types of spatial information when solving
spatial tasks. These results also agree with the suggestion that shape learning interacts with landmark learning in much the
same way as does learning about any pair of stimuli in a Pavlovian conditioning experiment. |
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