Spatial overshadowing in pigeons: Evidence for an acquisition deficit

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" Spatial overshadowing in pigeons: Evidence for an acquisition deficit "
Wong, Jared; Leising, Kenneth J.; Blaisdell, Aaron P

Document Type	:	AL
Record Number	:	936112
Doc. No	:	LA2p1212n7
Language of Document	:	English
Main Entry	:	Wong, Jared; Leising, Kenneth J.; Blaisdell, Aaron P
Title & Author	:	Spatial overshadowing in pigeons: Evidence for an acquisition deficit [Article]\ Wong, Jared; Leising, Kenneth J.; Blaisdell, Aaron P
Title of Periodical	:	International Journal of Comparative Psychology
Volume/ Issue Number	:	29
Date	:	2016
Abstract	:	We investigated theoretical accounts of spatial overshadowing using a landmark-based spatial-search task in a touchscreen preparation with pigeons. Pigeons first learned to find a hidden target on a screen using a compound of two visual cues as landmarks. Landmark A was proximal to the target while landmark X was distal to the target. Experiment 1 replicated our prior spatial overshadowing effect whereby landmark A overshadowed the development of spatial control by X. Spatial control by X was also poorer than by landmark Y which had been paired with the target alone but with the same absolute distance to the target as X had. Thus, the poor spatial control by X was not merely due to the greater X-target distance (relative to the A-target distance). Experiments 2a and 2b failed to find recovery from spatial overshadowing of X through either post-training extinction or counterconditioning of overshadowing landmark A, respectively. We interpret our results as being consistent with acquisition-focused models of elementary associative learning, but not with performance-focused models.