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Related Experiment Video

Updated: Feb 17, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

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The Posture of Putting One's Palms Together Modulates Visual Motion Event Perception.

Godai Saito¹, Jiro Gyoba¹

¹Department of Psychology, Graduate School of Art and Letters, Tohoku University, Sendai, Japan.

|December 7, 2017

Summary

Observer hand postures influence visual motion perception. Direct palm contact, not force, enhances the bouncing illusion in the stream/bounce display, indicating tactile cues are key.

Keywords:

force multisensory proprioception stream/bounce perception touch

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Area of Science:

Psychology
Neuroscience
Visual Perception

Background:

The stream/bounce display reveals how observers perceive object interactions.
Previous research linked hand posture to altered bounce perception, suggesting proprioception's role.

Purpose of the Study:

To differentiate the influence of tactile versus haptic (force) information from hand postures on visual motion perception.
To determine the primary sensory modality driving the hands-induced bounce effect.

Main Methods:

Participants viewed a stream/bounce display with objects moving towards each other.
Hand postures were manipulated: direct palm contact, palms separated by a brick, and varying grip force.
The percentage of perceived bouncing versus streaming responses was recorded.

Main Results:

Directly pressing palms together significantly increased bouncing perceptions.
Placing a brick between palms eliminated the bouncing enhancement.
Varying the force of palm contact did not affect bounce perception.

Conclusions:

The enhancement of bounce perception by hand posture is primarily mediated by tactile information from direct palm-to-palm contact.
Haptic force feedback does not significantly contribute to this visual perception effect.