Abstract
Summary The effects of acute exposure (5 min) to carbon dioxide (0–7.9%) on the EEGs and reaction times of five humans were investigated. Alpha frequency and alpha amplitude were recorded from the central and from the occipitalparietal areas of the scalp while subjects reacted with their right index finger to flashes of light. Variance analyses indicated that the percentage CO 2 inhaled significantly affected alpha frequency and reaction time. Alpha frequency and reaction time were significantly faster under the 0–5.5% CO 2 conditions than under the 7.9% CO 2 condition. A slight increase in alpha frequency and decrease in reaction time were evident under the 3.5 and 5.5% CO 2 conditions as compared to the 0 and 1.5% CO 2 conditions.
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