Effect of initial-pecking consequences on subsequent pecking in young chicks

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White Leghorn cockeral chicks ½ and 2½ days old received saline or LiCl injection immediately following their 1st feeding experience. When retested 5 hrs later 2½-day-old Ss that had received saline increased their pecking rate, but ½-day-old Ss showed no change. Only 2½-day-old chicks, therefore, appear to associate ingestion of food with long-term positive consequences. Ss of both ages, on the other hand, greatly reduced pecking when retested 5 hrs after LiCl injection. Thus, ½- and 2½-day-old chicks are capable of forming an association between pecking and its long-term consequence when the consequence is aversive. When LiCl injection was not contingent on pecking, following the initial feeding session by 6 hrs, Ss did not reduce retest pecking rates. (7 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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