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Related Experiment Video

Updated: Sep 28, 2025

The Attentional Set Shifting Task: A Measure of Cognitive Flexibility in Mice

The Attentional Set Shifting Task: A Measure of Cognitive Flexibility in Mice

Published on: February 4, 2015

Bright light exposure during simulated night work improves cognitive flexibility.

Erlend Sunde¹, Jelena Mrdalj², Torhild T Pedersen²

¹Department of Psychosocial Science, University of Bergen, Bergen, Norway.

Chronobiology International

|March 28, 2022

Summary

This summary is machine-generated.

Bright light exposure during night shifts can improve cognitive flexibility, specifically performance on reversal learning tasks. This finding suggests bright light may mitigate negative effects of night work on cognitive function.

Keywords:

Cognitive control LED decision making light emitting diode reversal learning sleep deprivation task switch working memory

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Area of Science:

Neuroscience
Chronobiology
Occupational Health

Background:

Night work is associated with sleepiness and reduced vigilant attention.
Total sleep deprivation is known to impair cognitive flexibility, particularly reversal learning.
The impact of night work on reversal learning and the potential mitigating effect of bright light remain unclear.

Purpose of the Study:

To investigate whether night work impairs reversal learning task performance.
To determine if bright light interventions can mitigate reversal learning deficits during night work.

Main Methods:

A counterbalanced crossover study involving young healthy individuals.
Participants completed a reversal learning task during three simulated night shifts (23:00-07:00).
Night shifts were conducted under two light conditions: bright light (~900 lx) and standard light (~90 lx).

Main Results:

Reversal learning performance decreased towards the end of night shifts in both light conditions.
Bright light exposure led to improved reversal learning performance at the end of night shifts compared to standard light.
Bright light mitigated performance deficits on the reversal learning task.

Conclusions:

Night work impairs cognitive flexibility as measured by reversal learning.
Bright light interventions during night work can mitigate these performance deficits.
Bright light may be beneficial for both vigilant attention and cognitive flexibility during night shifts.