Multivariate Analysis of Evoked Potentials and Semantic Meaning
Final rept. 1 Oct 1976-31 Jul 1978
ROCHESTER UNIV NY CENTER FOR VISUAL SCIENCE
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The research provides confirmation that Evoked Potentials contain information about the semantic meaning of word stimuli used to obtain them and that combinations of Evoked Potential components can identify the unknown semantic character of stimuli. Previous results involving the use of relatively pure semantic stimuli have been successfully extended to words which are semantically more complex. The detection of numerical information by means of Evoked Potentials was explored, and tentatively confirmed, by analyzing the responses to visual number symbols and a think cue . For both semantic and numerical meanings, the discriminant functions developed for a group of subjects worked equally well for each individual. An Evoked Potential component with a post-stimulus peak about 250 msec. was found to be related to storage of information in short-term memory. In a behavioral experiment which probed short- term memory, recall was predicted by the magnitude of the Storage Component.