title: Object, intensity and subject variables in visual evoked response.
abstract: 10 subjects were studied to determine AEP effects of square, circle, and blank stimuli with variable stimulus intensity. For the group as a whole, object and intensity effects were significant on a number of amplitude and latency measures, but the object effect appears largely to reflect the presence or absence of a figure, rather than its nature. Increased intensity differentially affected latency, shortening the first negative deflection while lengthening the second positive. Amplitude is generally increased with higher intensity. Analysis of within-subjects effects showed considerable variability as to which parameters were significantly related to the independent variables in individual subjects. A repeated-measures, within-subjects research strategy is seen as appropriate on the basis of these data.
mesh_terms: D000328:Adult; D004594:Electrophysiology; D005071:Evoked Potentials; D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D007206:Individuality; D008029:Lighting; D008297:Male; D010775:Photic Stimulation; D011930:Reaction Time; D014793:Visual Cortex / Q000502:physiology*