Intensity and the evoked occipitogram in man

Abstract

Individual differences in the waveforms of the visually evoked occipitograms in three trained observers have been shown to persist over 4–5 log units of stimulus intensity. In addition, some differences in the waveforms evoked by different monochromatic lights are reported for color-normal observers. The waveforms for one deuteranomalous observer are indistinguishable despite changes in both wavelength and intensity. In the normal observers, however, the waveforms do change as a function of intensity. For some colors these changes are such as to transform the responses for one wavelength into those for another. For some other colors, waveform differences persist despite intensity changes.