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Feeling darkness: a visually induced somatosensory illusion.

Uta Wolfe¹, Jacob A Comee, Bonne S Sherman

¹Psychology Department, Hobart and William Smith Colleges, Geneva, New York 14456, USA. uwolfe@hws.edu

Perception & Psychophysics

|November 21, 2007

Summary

Sensory processing is more integrated than previously thought. Eyelid position sense is influenced by visual illumination differences between the eyes, demonstrating cross-modal integration.

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Area of Science:

Neuroscience
Sensory Perception
Ophthalmology

Background:

Traditionally, the five primary senses are considered separate, but evidence of their interaction and neural underpinnings is emerging.
While limb position sense involves touch, proprioception, and spatial vision, the influence of fundamental visual information remains unclear.

Purpose of the Study:

To investigate whether non-spatial visual information, specifically relative illumination between the eyes, influences eyelid position sense.
To demonstrate a novel illusion revealing cross-modal sensory integration in fundamental sensory processing.

Main Methods:

An illusion was created by exposing one dark-adapted eye and one light-adapted eye to a dim environment.
Participants reported the perceived position of their eyelid.
Tactile interventions (covering the eye) were used to assess their effect on the illusion.

Main Results:

Participants reported a "droopy" or closed sensation in the eyelid of the light-adapted eye.
This illusion diminished when tactile information congruent with the visual disparity was introduced.
The effect highlights the influence of interocular illumination differences on proprioceptive sense.

Conclusions:

Eyelid position sense is partly dependent on relative visual illumination between the eyes.
Sensory integration extends beyond higher-level spatial vision to more fundamental aspects of sensory processing.
This finding challenges traditional views of sensory separation and highlights a more integrated sensory system.