Abstract
Testosterone-injected and control male chicks, in their second week of life, were observed during eight (massed) 1-min extinction trials of a runway response for a food reward. The hormone produced no overall differences in extinction rates but the following changes in behaviour were observed: first, increased frequency of contact with the empty food dish (pecking the outside, scratching, and treading); secondly, increased frequency of fixated gazing at the walls; thirdly, decreased looking up from the runway; and fourthly, increased head shaking. These results were discussed in relation to effects of testosterone on attack and attention.
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