Vestibular signals of self-motion modulate global motion perception

Area of Science:

• Neuroscience
• Perception Psychology
• Sensory Integration

Background:

• Perceptual ambiguity is common in visual stimuli, leading to phenomena like bistability.
• Bistable perception can be influenced by other sensory inputs, such as auditory and tactile stimuli.
• The impact of vestibular input, specifically from self-motion, on visual motion perception remains less understood.

Purpose of the Study:

• To investigate whether vestibular input generated by self-motion affects the perception of bistable visual motion stimuli (plaids).
• To determine if self-motion direction interacts with visual motion direction in influencing plaid perception.
• To explore the underlying mechanisms of sensory integration between vestibular and visual systems in motion perception.

Main Methods:

• Participants viewed bistable visual motion stimuli (plaids) while experiencing controlled self-motion.
• Experiment 1 assessed how different self-motion directions biased plaid interpretation (global coherence vs. transparent sliding).
• Experiment 2 examined the effect of orthogonal self-motion on one-dimensional visual motion perception.

Main Results:

• Vestibular self-motion significantly biased the interpretation of bistable visual plaids.
• The direction of self-motion modulated the likelihood of perceiving global coherence versus transparent sliding.
• Self-motion also biased the perceived direction of one-dimensional visual motion when directions were orthogonal.

Conclusions:

• Vestibular input from self-motion can systematically alter the perception of visual motion direction.
• The findings suggest a vector addition mechanism where self-motion influences visual motion perception.
• This demonstrates a cross-modal interaction where task-irrelevant vestibular signals affect visual motion processing.