Abstract
Electrophysiological studies of the brain potentials of urethane-anesthetized chickens revealed regions in midbrain, 'tween brain and forebrain that responded to clicks. Response latencies ranged from 2–6 msec in the lateral lemniscus and the region of nucleus isthmi, pars principalis, to 2–10 msec in nucleus mesencephalicus lateralis, pars dorsalis. In the thalamus shortest latencies were found in the vicinity of tractus nucleus ovoidalis (4–12 msec), those in nucleus ovoidalis (10–12 msec) were intermediate, and those in the dorsal nuclear complex (10–16 msec) exhibited longest delays. Nucleus rotundus was not activated by clicks. In the paleostriatum latencies were 9–10 msec, in caudal neostriatum 11–32 msec, and 5.5 msec or more in the frontal neostriatum.
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