Hemispheric differences in the recognition of partly occluded objects by newly hatched domestic chicks (Gallus gallus)

Animal Cognition
Lucia RegolinGiorgio Vallortigara

Abstract

Domestic chicks are capable of perceiving as a whole objects partly concealed by occluders ("amodal completion"). In previous studies chicks were imprinted on a certain configuration and at test they were required to choose between two alternative versions of it. Using the same paradigm we now investigated the presence of hemispheric differences in amodal completion by testing newborn chicks with one eye temporarily patched. Separate groups of newly hatched chicks were imprinted binocularly: (1) on a square partly occluded by a superimposed bar, (2) on a whole or (3) on an amputated version of the square. At test, in monocular conditions, each chick was presented with a free choice between a complete and an amputated square. In the crucial condition 1, chicks tested with only their left eye in use chose the complete square (like binocular chicks would do); right-eyed chicks, in contrast, tended to choose the amputated square. Similar results were obtained in another group of chicks imprinted binocularly onto a cross (either occluded or amputated in its central part) and required to choose between a complete or an amputated cross. Left-eyed and binocular chicks chose the complete cross, whereas right-eyed chicks did not choose t...Continue Reading

Citations

Jul 20, 2007·Animal Cognition·Valeria Anna Sovrano, Angelo Bisazza
Feb 5, 2010·Animal Cognition·Katerina Tvardíková, Roman Fuchs
Dec 10, 2008·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jonathan Niall DaisleyLucia Regolin
Feb 22, 2008·PLoS Biology·Giorgio VallortigaraLesley J Rogers
Aug 31, 2007·Perception & Psychophysics·Yasuo NagasakaEdward A Wasserman
Dec 14, 2011·Behavioural Brain Research·Orsola Rosa SalvaGiorgio Vallortigara
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Dec 19, 2019·Frontiers in Psychology·Leonardo VenturosoGianluca Esposito
Dec 26, 2019·Scientific Reports·Amalia P M Bastos, Alex H Taylor

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