Fig. 2.

Habituation of the acoustic startle response. Mean startle magnitude (in arbitrary units ± SEM) upon repeated presentation of a 110 dB startle stimulus in 129S6 (a) and SW mice (b) exposed to AFR (control, black squares) or MS (black triangles). In each block 10 startle stimuli were presented. Effects on wild-type and 1AKO mice are taken together, as the effects of MS were independent of genotype. The overall significant effect of rearing on startle reactivity in 129S6 is not indicated in Fig. 2a, as it was independent of block