Abstract

The activity of amygdala-lesioned rats was compared with that of normal controls and amygdala shams under shuttlebox conditions of total darkness and single-compartment illumination. Although the activity (movement between compartments) of the groups did not differ under either of these conditions, the single-compartment illumination significantly decreased the activity of all three groups. A further analysis of the percentage of test time spent in the illuminated compartment indicated that the amygdala-lesioned animals spent significantly less time there than did the other two groups. The differential effects of the lesions on activity and reactivity to light were discussed in terms of changes in general responsiveness following amygdala damage.

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