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Abstract
Male adult albino rats were divided into six groups: two pinealectomized (Px); two
sham-operated (Sh) and two serving as controls (C). Half of these groups were studied
in daylight and the other half at night. The animals were open-field tested and then
conditioned by the avoidance behavior test in the appropriate light period. No differences
were observed among the groups when they were conditioned in the dark; however, the
Px were conditioned significantly more rapidly than Sh or C in daylight. Intragroup
comparisons between night/day conditioning showed them to be similar in Px but more
rapid at night in both Sh and C. The Sh group is unique and not comparable to controls.