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This work was supported by grants (Ref: PSI2011-26850 to JP; and PSI2011-25071 to IL, FA, JP) from the Spanish Ministerio de Ciencia e Innovacion. BA's contribution was possible thanks to the European Union Erasmus Exchange Program. MMMF's contribution was possible thanks to the FPU program of the Spanish Ministerio de Educacion (AP2007-01332). The authors are indebted to Leon Prados, Antonio A. Artigas and Maria Cruz Alvarez who contributed to make it possible. Jose Prados gratefully acknowledges a period of study leave granted by the University of Leicester.

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Blocking in rats, humans and snails using a within-subjects design

Publicado en:BEHAVIOURAL PROCESSES. 100 23-31 - 2013-11-01 100(), DOI: 10.1016/j.beproc.2013.07.014

Autores: Prados, Jose; Alvarez, Beatriz; Acebes, Felix; Loy, Ignacio; Sansa, Joan; Manuela Moreno-Fernandez, Maria;

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Resumen

The present research investigated the blocking effect in three different species, rats, humans and snails in formally equivalent tasks using a within-subjects design. Experiment 1 demonstrated the blocking effect in a context-flavour aversive conditioning preparation in rats: Animals failed to associate a flavour with an illness episode when it was presented in a context in which the illness was already predicted by other cues. Experiment 2 replicated this blocking effect in humans assessing their ability to learn a goal location in a virtual environment: Participants failed to learn the location of the goal in reference to a spatial cue presented alongside other pre-trained spatial cues that already indicated its location. Finally, in Experiment 3, snails failed to associate an odour with the presentation of food in the presence of other odours that already reliably predicted its presentation. The present study offers a start point for systematic comparisons between vertebrate and invertebrate species in formally equivalent tasks that produce univocal demonstrations of the blocking effect. (C) 2013 Elsevier B.V. All rights reserved.

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