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| Year : 1992 | Volume
: 34
| Issue : 3 | Page : 253-259 |
Effect of Negative Ion Atmospheric Loading on Cognitive Performance in Human Volunteers
A Chitra Andrade1, Charlotte Fernandes1, Leila Verghese1, Chittaranjan Andrade2
1 Lecturer in Psychology, Mount Carmel College, Bangalore - 560 052, India
2 Assistant Professor in Psychopharmacology, National Institute of Mental Health and Neurosciences, Bangalore - 560 029, India
Correspondence Address:
Chittaranjan Andrade
Assistant Professor in Psychopharmacology, National Institute of Mental Health and Neurosciences, Bangalore - 560 029
India
 Source of Support: None, Conflict of Interest: None  | Check |
PMID: 21776128 
Negative ion atmospheric loading has been reported to affect a range of psychological functions, from alertness to circadian rhythms, and has been suggested to benefit a variety of medical conditions, from allergies to migraine. In a double-blind study planned to assess the effect of negative ions on cognitive performance in human volunteers, 65 female graduate course students were randomized into ionized atmosphere (n = 34) and control (n = 31) groups. The following cognitive tasks were administered: Digit Symbol Substitution Test, Addition Test, Visual Memory (Complex Figure) Test, Verbal Memeory (Complex Passage) Test, Ideational Fluency Test and Clerical Speed and Accuracy test. On all but the last two tests, the negative ion groupperfonned significantly better (to a 15-40% extent) than controls. It is concluded that negative ionization of the atmosphere by artificial means may be of benefit in certain common, practical situation in which depletion of these ions occurs.
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