Midlatency auditory evoked responses in the human and the cat model.

Findings from the experiments summarized above indicate that the MRL components, Pa and P1, are differentially affected by several functional and parametric variables, suggesting that each of these components reflects a separate and distinct generator system. Moreover, the similarities between the human Pa and the cat wave 7 suggest an auditory cortex origin of this component. The similarities between the human P1 and the cat wave A suggest that in the human, as in the cat, this potential may be generated by a component of the ascending reticular activating system.