Cortical Responses to Modulated Light in the Human Subject

K amp , A., C. W. S em ‐J acobsen , W. S torm van L eeuwen and L. H. V an der T weel . Cortical responses to modulated light in the human subject. Electrical responses to modulated light have been recorded from a patient with depth electrodes implanted in the visual cortex. Low modulation percentages still gave a response even in the second harmonic of the stimulating frequency. The high frequency part of the frequency response curve showed a decrease corresponding to perception. Towards low frequencies also a steep decrease in sensitivity has been found. The responses in different places near to each other were not highly correlated. A discussion about the theoretical aspects is given.