Isolated chicks, reared for 3 days with a hanging colored object, chose this object in a simultaneous choice test. Each S was then reared with an object of different color or shape and this became the preferred object after 3 or 6 days. The preference for the 2nd object was maintained when objects were absent for 3 days. Yellow and rectangular objects were less preferred than were blue, green, and ball-shaped objects. Newly-hatched chicks chose a ball in preference to a rectangular object. Color or shape preferences established during the critical period for imprinting can be reversed, although some stimuli may be intrinsically preferred.

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