Perception of time in microgravity and hypergravity during parabolic flight

Area of Science:

• Human Physiology
• Cognitive Psychology
• Space Medicine

Background:

• Understanding how altered gravity affects human perception is crucial for space exploration and long-duration missions.
• Previous research has explored various physiological and psychological effects of microgravity, but temporal perception remains less understood.

Purpose of the Study:

• To investigate the influence of different gravitational forces (0g, 1g, 1.8g) on the accuracy of human duration estimation.
• To differentiate the effects of gravity on time reproduction versus time production tasks.
• To assess the role of attention and memory in gravity-dependent temporal distortions.

Main Methods:

• Experiments conducted during parabolic flights on an Airbus A310, simulating 0g, 1g, and 1.8g conditions.
• Participants estimated durations (3.5s, 7s, 14s) using reproduction and production methods under control (counting) and concurrent reading conditions.
• Simple reaction times were measured to evaluate attentional levels.

Main Results:

• Temporal accuracy was significantly underestimated in 0g compared to 1g during the reproduction task with concurrent reading.
• Reaction times were prolonged in 0g, indicating reduced attentional capacity.
• No significant differences in duration estimates were observed in the production tasks across gravitational conditions.

Conclusions:

• The temporal underestimation observed in zero gravity is likely attributed to decreased selective attention and impaired episodic memory retrieval.
• Gravity-dependent alterations in cognitive functions, specifically attention and memory, significantly influence time perception.
• Findings highlight the complex interplay between environmental factors and internal timing mechanisms.