ERIC Number: ED250353
Record Type: RIE
Publication Date: 1984-Apr
Reference Count: 0
The Use of Event-Related Brain Potentials to Measure Cognitive Processing Deficits in the Brain-Injured.
Torello, Michael W., Jr.; And Others
Until recently it has been possible only to measure the behavioral products of cognitive processing, e.g. reaction time. However, this is a rather indirect way of studying brain substrates of cognition. Psychophysiological techniques can be used to study the neural mechanisms of cognition. In this experiment brain electrical activity was measured and a subcomponent of this electrical activity, the P300 wave, was identified in a population of normal and brain-injured adults while they were engaged in a visual discrimination task. The averaged amplitude of the P300 wave was significantly decreased and the averaged latency of the P300 wave was significantly increased in the brain-injured group. However, a trial-by-trial analysis revealed that near normal waveforms could be produced by the brain-injured subjects in a small percentage of trials. Since the P300 waveform is related to mechanisms of selective attention and short term memory, the appearance of normal P300 waves in the brain-injured group indicates that the stability of these cognitive processes, and not the processes themselves, were affected by the neurological insult to these patients. (Author)
Publication Type: Speeches/Meeting Papers; Reports - Research
Education Level: N/A
Authoring Institution: N/A
Identifiers: Brain Event Related Potentials; Brain Waves; Waveform Analysis
Note: Paper presented at the Annual Meeting of the American Educational Research Association (68th, New Orleans, LA, April 23-27, 1984).