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Goldfish (Carassius auratus) were presented with a “light-on” stimulus at 2-min intervals, and their cardiac and ventilatory responses were monitored. Normal fish, fish with sham operations for telencephalic lesions, and fish with bilateral electrolytic lesions of the telencephalon (anterior commissural and posterior telencephalic groups) were compared for responsiveness and habituation to regularly presented stimuli. There was no evident difference in responsiveness between the four groups, though 3 fish with lesions in the regions ventralis pars dorsalis and ventralis pars ventralis gave fright responses to novel stimuli. Lesions in posterior telencephalic regions dorsalis pars centralis and ventralis pars intermedialis and at the telencephalic/diencephalic border close to the habenula caused significant impairment of habituation.