Psychomotor performance after forward-facing impact.

Area of Science:

• Aerospace Medicine
• Human Factors Engineering
• Biomechanics

Background:

• Understanding the effects of impact forces on human performance is crucial for aviation safety.
• Previous research suggests potential links between impact acceleration and cognitive function, but data on forward-facing impacts is limited.

Purpose of the Study:

• To investigate the effects of forward-facing (-Gx) impact on psychomotor performance.
• To determine if increasing impact severity degrades reaction time and accuracy.
• To explore the influence of initial head position on head acceleration during impact.

Main Methods:

• 10 volunteers underwent 50 tests on a horizontal decelerator, experiencing impact levels from 0 G to 12 G.
• Psychomotor performance was assessed using a complex reaction time and accuracy task (manikin task).
• Linear and angular head accelerations were measured; two head positions were tested at 12 G.

Main Results:

• No statistically significant degradation in psychomotor performance was observed with increasing impact severity.
• A weak correlation was noted between angular head acceleration and prolonged reaction time.
• Significantly lower angular head acceleration occurred when the head was initially rotated forward compared to upright.

Conclusions:

• The tested impact levels may not have been sufficient to elicit performance changes, or the manikin task lacked sensitivity.
• A forward-rotated head position may mitigate head acceleration, potentially reducing stunning effects for aircrew in crash scenarios.