Figure 1.

Time spent investigating the stimulus female (in seconds; Means ± S.E.M.) by gonadally intact (above) and castrated and EB+DHTP treated males (below) of the two genotypes. During the four first trials, animals were in contact with the same ovariectomized female stimulus. On the fifth trial, males were exposed to the same (black circle) or to a new female (open circle). P<0.05 * different from the time spent in olfactory investigation by the same group on the fourth trial.