Ontogenetic differences in the expression of conditioned visual aversions.
We examined ontogenetic differences in the expression of conditioned visual aversions. Sprague-Dawley-derived rats, 16 or 21 days of age, were conditioned with either an element (brightness) or compound (brightness/odor) CS+ and tested for their aversion to the common element (brightness). Aversions to the brightness cue were assessed by either a traditional test of preference between the CS+ brightness and a contrasting brightness or by assessment of freezing in the presence of either brightness cue. The results indicated that strength of conditioning as well as the expression of overshadowing/potentiation was dependent on the age of the animal and on the technique used to assess conditioning.
Jagielo
Joyce A
JA
Department of Psychology, Edinboro University of Pennsylvania, Edinboro, PA 16444, USA.
Miller
James S
JS
Spear Smith
Jennifer
J
Spear
Norman E
NE
D000375:Aging / Q000523:psychology*; D000818:Animals; D000831:Animals, Newborn; D001245:Association Learning; D001362:Avoidance Learning; D003214:Conditioning, Classical; D005239:Fear; D005260:Female; D008297:Male; D009043:Motor Activity; D051381:Rats; D017207:Rats, Sprague-Dawley; D012903:Smell; D014796:Visual Perception