SubjectsFour adult, experimentally naive homing pigeons of undetermined sex were deprived to 80% of their free-feedin g weights. Water was continuously available in individual horne cages.
ApparatusThe experimental enclosure was 59.8 x 24.0 x 25.0 ern high. The front panel (24 .0 x 25.0 ern) was stainless steel and contained three keys 2.54 ern in diameter. Only the right key was used. The left key was dark and inoperative, and the cen ter key
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.