Perinatal exposure to a noncoplanar polychlorinated biphenyl alters tonotopy, receptive fields, and plasticity in rat primary auditory cortex
2007
PCBs Affect Brain Development in Rats
publication
Evidence: moderate
Author Information
Author(s): Tal Kenet, Susan Schantz
Primary Institution: Harvard Medical School and Massachusetts General Hospital
Hypothesis
Does exposure to PCB95 during gestation and nursing affect brain development in rats?
Conclusion
Exposure to PCB95 leads to abnormal development of the auditory cortex in rats, which may impact how they interpret sound.
Supporting Evidence
- PCB95 exposure caused disorganized auditory cortex maps in rats.
- Rats exposed to PCB95 showed imbalances in brain signaling.
- Children with autism have similar imbalances in their brains.
- Epidemiological studies link prenatal PCB exposure to poorer verbal learning in children.
Takeaway
Rats exposed to a chemical called PCB95 during pregnancy and nursing had problems with how their brains processed sounds.
Methodology
Pregnant rats were fed PCB95 daily, and the auditory cortex of their pups was mapped using electrodes.
Limitations
The study used a very high dose of PCB95, which may not reflect typical human exposure levels.
Participant Demographics
Pregnant rats and their pups were used in the study.
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