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In this research, we estimated temporary change of brain activities in auditory oddball paradigm by moving an analysis time window. An advantage of this method is that it can acquire rough changes of activated areas even with data having low time resolution. Eight normal subjects participated in the study, which consisted of a random series of 30 target and 70 nontarget stimuli. We investigated the activated area in three kinds of analysis time sections, from stimulus onset to 5 seconds after the stimulus (time section A), from 2 to 7 seconds after (B) and from 4 to 9 seconds after (C). In time section A, representative activated areas were regions including superior temporal gyrus centered around inferior frontal gyrus, left precentral gyrus corresponding to Broadmann area 6 (BA 6), right fusiform gyrus corresponding to BA 20, bilaterally medial frontal gyrus and right inferior temporal gyrus were activated. In B, we could see the activations in bilatelally cerebellum, inferior frontal gyrus, and region including left motor area. In C, bilatelally postcentral gyrus, left cingulate gyrus , right cerebellum and right insula were activated. Most activations were consistent with previous studies.

Estimation of Temporary Change of Brain Activities in Auditory Oddball Paradigm