2024-08-292024-08-291998Ψυχολογία (τόμος 5) (τεύχ. 2) 95-102 (1998)https://beta-pandemos.panteion.gr/handle/123456789/1762Newborn chicks were trained in a simultaneous-discrimination task to peck selectively either at a red versus green or at a small versus large box. Pecking at the correct box was reinforced by a combination of a hen's maternal call and/or the delivery of a stream of warm air or selectively by the former or the latter as a single reinforcer, always together with food, and furthermore with food only8 σ.enΨυχοφυσικήPsychophysicsΑντίληψη στα βρέφηPerception in infantsάρθρο