The effects of grating complexity on transient evoked potentials.
In the present investigation, the effects of spatial frequency (1.0, 3.0 and 9.0 c/deg), grating complexity (1 + 3 or 3 + 9), and relative phase relationships (peaks-add or peaks-subtract) on the amplitude and latency of VEP components were examined with a pattern appearance (50 msec, 1.9 Hz) technique. The effects of temporally modulating one spatial component of a complex grating while the other component was continuously viewed were also investigated. Two components of the response obtained with pattern appearance were differentially affected by these stimulus manipulations. In general, most conditions that involved spatial complexity resulted in a loss of information that could be obtained when simple sine-waves were used.
D000328:Adult; D001921:Brain / Q000502:physiology; D005074:Evoked Potentials, Visual; D005556:Form Perception / Q000502:physiology*; D005583:Fourier Analysis; D006801:Humans; D011930:Reaction Time / Q000502:physiology