The Role of Visual Perception in Spoken Responses

How subjects voice responses to flashed visual symbols was investigated at successive stages of the information processing. The representation exits from V1 mainly by 120–140, mean 130ms; cortical motor output to voice onset has a mean delay of 85ms. The latencies of voicing only a noise, blurting versus perceiving before responding correctly yield mean delays for perception (85ms) and for spatio-temporal motor coding of digits (45ms), with a mean total delay of 345ms. Prefrontal cortex and Intralaminar N. also contribute to perception.