Abstract
Occipital EEG was monitored during long‐term exposure to visual stimulus arrays of five levels of complexity. Integrated EEG output was recorded for nine separate frequency bands. The stimuli were two, four, eight, 16 or 32 randomly located white squares on a black background. Mid‐alpha activity (8·5–10·5 Hz) decreased linearly with log2n, where n = number of squares in the array (P < 0·01). Beta activity (12·5–16·5 Hz) showed a quadratic trend (P < 0·02). Theta activity (5·5–7·5 Hz) increased linearly with ascending complexity (P < 0·05). There were no significant trends for low alpha (7·5–8·5 Hz) or high alpha (10·5–12·5 Hz). Brightness‐control slides showed no parallel effects.
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