Stimulus complexity, EEG abundance gradients, and detection efficiency in a visual recognition task.

British Journal of Psychology
A GaleA Smallbone

Abstract

Occipital EEG was monitored while subjects inspected 27 projected patterns. The number (N) and variety (V) of elements in the patterns were varied systematically. There were three levels of N (6, 12 or 24 elements) and three levels of V (circles, squares or hexagons occupying all, one half or one third of the element locations for all levels of N). Subjects were instructed that they would be required in a post-test to recognize the patterns, among patterns which had not appeared; they were also informed that the patterns had been constructed according to a set of simple rules, but the nature of these rules was not made fully explicit. The EEG was quantified by means of low-frequency analysis, yielding measures of abundance (theta, alpha and beta) and mean dominant frequency. For the recognition task, nine stimulus items were embedded among 45 items. Recognition efficiency was measured by means of the signal detection theory discrimination index (d'). The results were as follows: (i) Both N and V were inversely related to alpha abundance (P less than 0-01); (ii) the strongest relationship between stimulus parameters and the EEG held for N and EEG beta activity (13-5-19-5 Hz;P less than 0-001), where again the EEG and N were inve...Continue Reading

Citations

Sep 1, 1976·Biological Psychology·K Osborne, A Gale
Mar 1, 1977·Biological Psychology·D L Schacter
Mar 1, 1978·Biological Psychology·J C Shaw
Dec 1, 1979·Biological Psychology·G Spratt, A Gale
May 9, 2000·Pharmacology & Therapeutics·M A WhittingtonR D Traub
Sep 11, 2012·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Yu-Chieh Chang, Shwu-Lih Huang
Mar 15, 2006·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Vladimir V Lazarev

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