Psychophysical evidence for an internal model of gravity in the visual and vestibular estimates of vertical motion duration
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View abstract on PubMed
Summary
This summary is machine-generated.The brain uses an internal model of gravity to estimate motion duration. Downward movements are perceived as shorter than upward movements, reflecting gravity
Area Of Science
- Neuroscience
- Perception
- Human Sensory Systems
Background
- Gravitational acceleration influences vertical motion perception.
- The visual system has low sensitivity to acceleration.
- Otolith organs cannot distinguish gravitational from inertial acceleration.
Purpose Of The Study
- To test if the brain uses an internal gravity model to estimate vertical motion duration.
- To investigate how the brain predicts acceleration/deceleration due to gravity for motion timing.
Main Methods
- Participants judged motion duration in visual, vestibular, and combined visual-vestibular conditions.
- Experiments involved upward/downward motion of visual targets or participants.
- Participants maintained a straight-ahead gaze throughout trials.
Main Results
- Downward motions (visual or self-motion) were perceived as shorter than upward motions.
- This perception aligns with an internal model predicting gravity's effect on acceleration.
- In visual-vestibular conditions, no significant duration difference was found between upward and downward self-motion, but with high inter-subject variability.
Conclusions
- The brain employs an internal model of gravity to predict and perceive vertical motion durations.
- This model accounts for gravity's accelerating effect on downward and decelerating effect on upward motion.
- Perception of self-motion duration is subject to individual differences and sensory integration.
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