The effects of artificial negative or positive ionisation of the air on the performance of a number of psychomotor tasks was studied on 45 human subjects. The results indicate that negative ionisation is associated with a significant increment in performance as compared to controls whilst positive ionisation appears not to have any effect. Additionally it is noted that both positive and negative ionisalion appears to influence the amplitude of the normal circadian rhythm of performance. The possible mechanisms by which ionisation might exert an influence on performance and the possible practical importance of the circadian rhythm effect are discussed.
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Hawkins et al. (1978) studied this question.
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