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Shown is the test for burying of marbles placed on the surface of the embedding material. (a) Whereas both genotypes were equally efficient in the burying, (b) significant differences were observed in rearing time during the test interval and (c) the latency time before the first burying attempt. Genotype differences were evaluated by unpaired t-test; WT (white): n = 6; Per1−/− (grey): n = 11; ***p ≤ 0.001; *p ≤ 0.05. All values are given as mean ± s.e.m.
