Abstract
Isolated male Wistar rats exhibited muricide, friendly or indifferent behavior when exposed to mice. Rats from each category were treated with α-methyl-p-tyrosine, 6-hydroxydopamine and electrolytic lesion of the midbrain-raphe nucleus and reexposed to mice at regular intervals. Aggregated control rats were treated similarly. All three treatments rendered the indifferent rats more reactive and aggressive after 6-hydroxydopamine and midbrain-raphe lesion. The friendly rats became less reactive post-treatment, then recovered, but never exhibited aggression. The muricide rats were virtually unaffected by any treatment. A third of the aggregated control rats showed aggressive and muricide behavior both after 6-hydroxydopamine and midbrain raphe lesions.
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