Visually Evoked and Spontaneous Potentials of the Human Cortex

Abstract

The spontaneous brain potentials can be influenced by light stimuli (Adrian & Matthews 1934). By inspection of VECP recordings possible changes of the spontaneous brain activity can usually not be recognized. These changes, however, may influence the responses from the visual pathways (Bishop 1933). To evaluate the interaction between EEG and VECP, visually evoked potentials were recorded with periodic and non-periodic stimulation at different stimulus repetition frequencies in 30 human volunteers. The results of these experiments are demonstrated and the possibility of interaction between the EEG and VECPs as suggested by Trimble & Potts (1975) is discussed.