Exposure to polybrominated biphenyls. Some effects on personality and cognitive functioning

Area of Science:

• Environmental Health
• Neurotoxicology
• Psychology

Background:

• Polybrominated biphenyls (PBBs) are persistent organic pollutants with potential neurotoxic effects.
• Previous studies suggest PBB exposure may impact cognitive and psychological functioning.

Purpose of the Study:

• To assess the cognitive and psychological effects of PBB exposure in individuals with persistent medical complaints.
• To investigate the relationship between PBB adipose levels and performance on various neurobehavioral tests.

Main Methods:

• A cohort of 21 PBB-exposed individuals with medical complaints was compared to hospital volunteers.
• Neuropsychological testing included measures of memory, motor skills, sensory perception, personality, and cognitive function.
• PBB adipose levels were measured and correlated with test performance.

Main Results:

• PBB adipose levels did not correlate with any measured cognitive or motor test performance.
• PBB-exposed individuals exhibited differences in the Minnesota Multiphasic Personality Inventory, indicating adjustment reactions with depressive symptoms and somatization.
• Initial impairments in prose recall, short-term memory, concentration, and cognitive flexibility in the PBB group disappeared when education and personality differences were statistically controlled.

Conclusions:

• While PBB exposure may be associated with personality changes and somatization, direct neurocognitive deficits were not confirmed in this study.
• The observed cognitive differences were likely confounded by education and personality variables, not solely by PBB exposure.
• The study's selective admission criteria limit the generalizability of findings to the broader PBB-exposed population.