Visual evoked-response correlates of speechreading performance in normal-hearing adults: a replication and factor analytic extension.
The relationship between the latency of the negative peak occurring at approximately 130 msec in the visual evoked-response (VER) and speechreading scores was investigated. A significant product-moment correlation of -.58 was obtained between the two measures, which confirmed the fundamental effect but was significantly weaker than that previously reported in the literature (-.90). Principal components analysis of the visual evoked-response waveforms revealed a previously undiscovered early VER component, statistically independent of the latency measure, which in combination with two other components predicted speechreading with a multiple correlation coefficient of .84. The potential significance of this new component for the study of individual differences in speechreading ability is discussed.
D000328:Adult; D005074:Evoked Potentials, Visual; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008085:Lipreading; D008297:Male; D010775:Photic Stimulation; D011930:Reaction Time; D014796:Visual Perception / Q000502:physiology