Abstract
The behavior of testosterone-treated (T) and control (C) chicks in a novel environment was investigated during their first 2 wk of life, with the aid of video-recordings. T and C chicks showed several marked and significant differences in behavior: Ts spent less time peeping, made fewer head movements while “scanning” the new environment, showed longer visual “fixation” times, and fewer head movements before changing their direction of head movement. These measures were significantly correlated to one another for Ts, and it was argued that they reflected a single effect of the hormone. It was suggested that this single effect acted on attentional mechanisms, and the relation of this to effects of testosterone on emotional behavior was discussed.
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