Abstract
Adult male pigeons (Columba livia) were used to study the effects of basal forebrain lesions upon a measure of responsiveness to the environment, locomotor activity. Daily activity as well as food and water intake and body weight were recorded for Ss through various experimental test phases. Significant reductions occurred in activity scores of all but one experimental S following lesioning, with no changes occurring in controls during comparable test periods. Intrasession analyses of activity showed a tendency for lesion-produced activity depression to affect initial period scores most severely. Small lesions were identified in the parolfactory lobe and paleostriatum or anterior (ventral) thalamic and hypothalamic areas. A possible neuroanatomical explanation for these results was discussed.
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