Short-term PM_2.5 exposure and cognitive function: Association and neurophysiological mechanisms

Area of Science:

• Environmental Health
• Neuroscience
• Cognitive Science

Background:

• Growing evidence links fine particulate matter (PM2.5) to adverse brain effects.
• The impact of short-term PM2.5 exposure on cognitive function and its neurophysiological mechanisms require further investigation.

Purpose of the Study:

• To examine the association between short-term PM2.5 exposure and executive function in young adults.
• To investigate the neurophysiological mechanisms, specifically electroencephalogram (EEG) signals, mediating this association.

Main Methods:

• A longitudinal observational study involving 90 young adults with four repeated measurements.
• Personal PM2.5 exposure was monitored for one week, followed by executive function assessment using the Stroop test and EEG recording.
• Linear mixed-effect models and mediation analysis were employed to analyze the data.

Main Results:

• Elevated PM2.5 exposure (lag-3) was associated with declined performance on the Stroop test.
• Reduced lower and upper alpha event-related desynchronization (ERD) during cognitive tasks, indicating impaired executive control, were observed.
• Alpha ERD mediated the association between short-term PM2.5 exposure and executive function deficits.

Conclusions:

• Short-term exposure to PM2.5 is linked to executive dysfunction in young adults.
• Reduced alpha ERD represents a potential neurophysiological pathway for PM2.5-induced cognitive impairment.