Neurocognitive Performance Deficits Related to Immediate and Acute Blast Overpressure Exposure.

Area of Science:

• Military medicine
• Neuroscience
• Occupational health

Background:

• Sub-concussive blast effects are increasingly recognized for their potential to cause negative outcomes in military personnel.
• These effects, below the threshold for a concussion diagnosis, can still lead to symptom reporting and impaired performance.
• Understanding these impacts is crucial for safeguarding the cognitive health of service members.

Purpose of the Study:

• To evaluate the effects of explosive blast overpressure and impulse at the sub-concussive level on neurocognitive performance.
• To identify specific neurocognitive tasks sensitive to detecting performance changes after blast exposure.
• To determine which blast characteristics are most associated with observed performance decrements.

Main Methods:

• Neurocognitive performance was assessed using the Defense Automated Neurobehavioral Assessment (DANA) system.
• Data were collected across seven US Military breacher training courses.
• 202 healthy, male military volunteers participated in the study.

Main Results:

• The DANA Procedural Reaction Time (PRT) subtask was most sensitive in detecting transient cognitive impairment.
• Peak overpressure was consistently associated with performance changes.
• Increasing peak overpressure correlated with temporary degradations in neurocognitive performance on the PRT subtask.

Conclusions:

• Sub-concussive blast overpressure can transiently impair neurocognitive performance, particularly on tasks like the DANA PRT.
• The findings suggest that even non-diagnosable blast exposures may affect cognitive capabilities.
• This research highlights the need for monitoring and mitigation strategies for blast exposure in military training environments.