Abstract
Seventeen-day-old and 38-day-old rats were compared on position habit reversal. Ss were drawn from the same litters and assigned randomly to either the 17-day-old or the 38-day-old test condition. The 17-day-old and the 38-day-old groups were matched on position habit acquisition. The 17-day-old group was significantly poorer on position habit reversal (p <.01). Spontaneous alternation levels in the two groups were also compared. Both groups exhibited chance levels of ahernation (X = 57%). The litter mothers (N = 4) alternated significantly above chance (X = 83%), but were similar to their 38-day-old offspring on position habit reversal. The poor reversal performance of the 17-day-old group is consistent with the hypothesis that hippocampal integrity in the rat develops at approximately 30 days of age.
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