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Up-down asymmetry in vertical vection
Yasuhiro Seya1, Hiroyuki Shinoda1, Yoshiya Nakaura1
1Department of Human and Computer Intelligence, Ritsumeikan University, Japan.
Vision Research
|November 1, 2015
Summary
This study found that the sensation of self-motion (vection) is stronger when visual stimuli move upward compared to downward. This up-down asymmetry in vection is similar to that observed in eye movements (optokinetic nystagmus), suggesting shared underlying mechanisms.
Area of Science:
- Neuroscience
- Human Perception
- Visual Neuroscience
Background:
- Vertical optokinetic nystagmus (OKN) exhibits an up-down asymmetry, with larger responses to upward visual motion.
- Vection, the illusory sensation of self-motion, is a key phenomenon in understanding visual-vestibular interactions.
Purpose of the Study:
- To determine if vertical vection also displays an up-down asymmetry, mirroring findings in vertical OKN.
- To explore the relationship between the mechanisms underlying vection and OKN.
Main Methods:
- Three experiments involved participants viewing vertically moving random-dot patterns.
- Participants reported vection using a joystick and rated its magnitude.
- Eye movements and vection magnitude were measured in one experiment.
Main Results:
- Vection magnitude was significantly larger for upward stimulus motion than for downward motion.
- Up-down asymmetry in vection became more pronounced over time.
- Experiment 3 confirmed up-down asymmetry in both vection and OKN.
Conclusions:
- Vertical vection demonstrates an up-down asymmetry, consistent with vertical optokinetic nystagmus.
- The findings suggest a close relationship between the neural mechanisms driving vection and OKN.
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