Table 1. Tendency to return to the previous day's platform location on trial 1.

Percent time and percent path length (Trial 1, Day N) recorded in the target zone (14cm in diameter) centring on the previous day's (Day N-1) platform position. Data (mean±SE) presented were collapsed across days. Both mutant and control mice exhibited a tendency to return to the vicinity of the former platform position as would be expected by chance alone (i.e., >1.9%; p's<0.05 based on one-sample t-test).

Trial 1-2 Delay	Days included	Variable	Mutant	Control
15 sec	Days 2-6	% time	4.62±0.56	3.64±0.67
		% path length	4.81±0.63	4.08±0.75
10 min	Days 8-12	% time	3.94±0.34	3.58±0.41
		% path length	4.43±0.42	4.87±0.49