Abstract
The relationships between two brain stem regions where electrical stimulation (ESB) evokes repetitive vocalizations in birds were investigated in anesthetized chickens. Electrodes were placed in the midbrain call region (MCR) and in a region ventral to <i>nucleus ovoidalis </i>(OM) and checked for ESB-evoked calling. Then radio-frequency lesions were made in MCR and the OM site retested for evoked vocalizations. Lesions in MCR abolished calls evoked from OM indicating that OM excitation produces calls via ipsilateral MCR.
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