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Chronic low-level mercury exposure and neuropsychological functioning.
Journal of Clinical and Experimental Neuropsychology
|October 1, 1986
Summary
Chronic low-level inorganic mercury exposure in dental workers caused mild deficits in nonverbal recall and increased psychological distress. Other cognitive and motor functions remained unaffected, indicating specific neurotoxic effects.
Area of Science:
- Neuroscience
- Occupational Health
- Toxicology
Background:
- Dental auxiliary workers may face chronic low-level exposure to inorganic mercury.
- Mercury's neurotoxic effects are a significant public health concern.
- Assessing subtoxic mercury exposure requires sensitive neuropsychological evaluation.
Purpose of the Study:
- To evaluate the neuropsychological effects of chronic low-level inorganic mercury exposure.
- To compare cognitive and psychological functioning between exposed and unexposed dental workers.
Main Methods:
- Neuropsychological testing was performed on 13 female dental auxiliary workers with elevated mercury levels and 13 controls.
- Head mercury levels were quantified using X-ray fluorescence.
- A battery of tests assessed cognitive, attention, and psychological domains.
Main Results:
- Workers with elevated mercury levels showed significantly poorer performance on the Recurrent Figures and SCL-90-R tests.
- No significant differences were observed in WAIS, Rey's AVL, PASAT, BGT, Grooved Pegboard, or Finger Tapping.
- Elevated mercury levels correlated with mild deficits in short-term nonverbal recall and increased psychological distress.
Conclusions:
- Chronic subtoxic inorganic mercury exposure can lead to subtle neuropsychological impairments.
- Specific deficits in nonverbal recall and heightened psychological distress are associated with mercury exposure.
- General intellectual functioning, attention, and motor skills appear unaffected at these exposure levels.