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Neurobehavioral effects of repeated sublethal soman in primates
Pharmacology, Biochemistry, and Behavior
|December 1, 1985
Summary
Sublethal exposure to soman, an organophosphate nerve agent, caused immediate and persistent behavioral deficits in baboons, including attentional deficits and seizures. Delayed effects, such as increased random responses, also emerged weeks later, suggesting potential irreversible neurological damage.
Area of Science:
- Neuroscience
- Toxicology
- Behavioral Science
Background:
- Organophosphate nerve agents like soman pose significant threats to cognitive function.
- Understanding the long-term neurological and behavioral consequences of sublethal nerve agent exposure is crucial for developing effective countermeasures.
Purpose of the Study:
- To investigate the behavioral effects of repeated sublethal soman exposure in a primate model.
- To characterize the immediate, persistent, and delayed effects of soman on cognitive performance.
Main Methods:
- Juvenile male baboons were trained on a match-to-sample discrimination task.
- Animals were exposed to varying doses of soman under acute and subchronic schedules.
- Acetylcholinesterase activity was measured to confirm soman potency.
Main Results:
- Soman exposure led to dose-related increases in response time and errors, and decreased extra responses.
- Persistent attentional deficits and generalized seizures were observed at higher doses.
- Delayed effects included a marked increase in random responses weeks after exposure cessation.
Conclusions:
- Sublethal soman exposure induces a complex profile of immediate, persistent, and delayed behavioral impairments.
- Attentional deficits and seizures may be linked to irreversible neurological damage.
- These findings highlight the potential for long-term cognitive dysfunction following nerve agent exposure.
