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Related Experiment Video

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Three Dimensional Vestibular Ocular Reflex Testing Using a Six Degrees of Freedom Motion Platform

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Published on: May 23, 2013

Positional and directional preponderances in vection.

Takeharu Seno¹, Takao Sato

¹Intelligent Modeling Laboratory, Department of Psychology, Graduate School of Humanities and Sociology, University of Tokyo, Tokyo, 113-0033, Japan. seno@l.u-tokyo.ac.jp

Experimental Brain Research

|September 27, 2008

Summary

Subcortical pathways contribute to vection, a sense of self-motion. Directional and positional biases in vection strength were observed with first-order motion stimuli, suggesting a subcortical origin for these effects.

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Area of Science:

Neuroscience
Visual Perception
Human Physiology

Background:

Vection, the illusory sensation of self-motion, is crucial for spatial orientation.
Optokinetic nystagmus (OKN) exhibits directional and positional biases, suggesting subcortical involvement.
Investigating vection biases can elucidate the neural pathways underlying self-motion perception.

Purpose of the Study:

To investigate the subcortical contribution to vection by examining motion direction and stimulus presentation biases.
To determine if biases observed in optokinetic nystagmus (OKN) are also present in vection.
To differentiate between subcortical and cortical processing of motion stimuli in vection.

Main Methods:

Subjects monocularly viewed hemi-field motion stimuli (luminance or contrast modulated gratings).
Participants performed magnitude estimations of vection strength.
Subjective ratings of motion impression were also collected.

Main Results:

Significant directional (temporonasal vs. nasotemporal) and positional (nasal vs. temporal retina) biases in vection strength were found for luminance-modulated stimuli.
Vection was stronger for nasotemporal motion and nasal retinal presentation.
These biases vanished for contrast-modulated (second-order) stimuli, indicating a potential cortical role.

Conclusions:

The observed biases in vection strength suggest the involvement of subcortical pathways.
First-order motion processing for vection appears to rely on subcortical structures.
Second-order motion processing, unaffected by these biases, may involve cortical pathways.