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Related Experiment Video

Updated: Apr 11, 2026

Assessing Pupil-linked Changes in Locus Coeruleus-mediated Arousal Elicited by Trigeminal Stimulation

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Published on: November 26, 2019

Eye closure enhances dark night perceptions.

Stefan Brodoehl^1,2, Carsten M Klingner^1,2, Otto W Witte^1,2

¹Hans Berger Department of Neurology, University of Jena, Germany.

Scientific Reports

|May 28, 2015

Summary

This summary is machine-generated.

Closing your eyes enhances touch sensitivity by shifting brain processing from visual to somatosensory dominance. This occurs even in darkness, indicating a fundamental change in sensory processing modes.

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Area of Science:

Neuroscience
Sensory Perception
Cognitive Science

Background:

The visual system often dominates sensory input.
Closing eyes is a common strategy to improve tactile exploration.
The neural mechanisms underlying this sensory shift are not fully understood.

Purpose of the Study:

To investigate how eye closure affects somatosensory perception.
To explore the neural basis of enhanced tactile sensitivity with eye closure.
To determine if eye closure alters brain processing modes.

Main Methods:

Healthy subjects performed a tactile discrimination task with eyes open and closed.
Functional neuroimaging (fMRI) was used to measure brain activity.
Experiments were conducted under ambient light and in complete darkness.

Main Results:

Eye closure decreased the perception threshold, increasing tactile sensitivity under both light conditions.
In darkness, eye closure increased occipital blood-oxygen-level-dependent (BOLD) activity in somatosensory and visual areas.
Enhanced thalamo-somatosensory cortex coupling and decreased visual-somatosensory connectivity were observed.

Conclusions:

Eye closure improves somatosensory perception beyond simply reducing visual input.
The act of closing eyes triggers a shift in brain processing from visual to non-visual dominance.
This suggests a fundamental alteration in thalamo-cortical network activity during eye closure.