Negative Air Ions in Neuropsychiatric Disorders

Abstract

Background: Air ions (AIs) are clusters of ionized particles present in the atmosphere and carrying an electrical charge of negative or positive polarity. Past speculations suggested that exposure to positive air ions may be harmful, while exposure to negative air ions (NAIs) may be associated with beneficial health effects. Increasing attention has been directed towards investigating the potential effect of NAIs on human brain activities since initial observations of their beneficial effects on some cognitive processes and mood. Aims: Given the paucity and scattered literature, the aim of our paper is at reviewing available studies on potential positive effects of NAIs exposure on cognitive performances and depression. Discussion: The review of the literature seems to confirm effects of NAIs on several brain functions. Indeed, a significant association between NAIs exposure and both wellbeing and high cognitive performances has been described. However, the exposure to high concentrations of NAIs could be related to improvement of depressive symptoms. Conclusion: A growing evidence of data, although not yet conclusive, would suggest that NAIs might improve cognitive processes. These findings require specific and urgent controlled trials adopting systems based on AIs release to possible prevent and treat cognitive dysfunctions present in a broad range of neuropsychiatric conditions.

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“…These findings are consistent with those of previous studies. NAIs have many benefits in brain function [44]. Research on the effects of NAIs on cognitive function in young male adults found that participants in the NAI session demonstrated shorter reaction times and higher accuracy for both Stroop congruent and incongruent trials [23].…”

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“…The constantly developing urbanization also means that people spend most of their time living in a city, therefore enduring severe pollution, which causes diverse syndromes. A shortage of negative ions is also ascribed for poor health [34]. Negative ions can improve melancholy and enhance felicity, alleviating the allergy caused by dust, fungus spores, and allergens [35].…”

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“…The review of the literature seems to confi rm effects of negative air ions (NAIs) on several brain functions. Indeed, a signifi cant association between NAIs exposure and both wellbeing and high cognitive performances has been described [1][2][3].…”