Abstract
One hundred experimental Ss [subjects] from undergraduate psychology classes performed research tasks under an increased density of negative ions, while 100 control Ss performed under normal room conditions. The problem was to determine the effects of increased negative ionization upon discrimination reaction time and manipulative dexterity tasks. Increased negative ionization had a significant effect upon latency of reaction time (p<.01) but not upon measures of manipulative dexterity. Simple forms of behavior seem to be influenced more by negative ionization than more complex behaviours.

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