Abstract
Tonic immobility was induced in 3- and 7-day-old chicks by a ventral restraint procedure in the presence of familiar or unfamiliar geometric shapes or blank test box walls. Older chicks exhibited longer immobility reactions, fewer spontaneous terminations, and deeper stages of immobility in all test conditions. Younger chicks responded selectively to environmental test conditions, showing attenuated response in the presence of familiar shapes and stronger reactions to unfamiliar shapes. Results were discussed in terms of differential fearfulness as a function of age-related experience.
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