Proportion of total time sniffing a stimulus in the three-chamber social test.

<p>In the three-chamber social test the proportion of the total time sniffing the novel mouse or an alternative (social or not) can be used as a measure of preference, with a dashed line at 50% indicating a lack of preference. A: All groups showed a strong preference for the social stimulus without any genotype effects; B: All groups showed a strong preference for the novel social stimulus, with no genotype effects. Sniffing was scored manually. Data shown are means ± SEM.