Sleep deprivation undermines the link between identity and intergroup bias
Jinxiao Zhang1, Yang Yang2, Ying-Yi Hong1,2
1Department of Psychology, Stanford University, CA.
Sleep
|September 26, 2019
Summary
Sleep deprivation increases intergroup bias by impairing cognitive control. Adequate sleep allows common ingroup identity to reduce bias, but this effect disappears with insufficient sleep.
Area of Science:
- Social Psychology
- Cognitive Neuroscience
Background:
- Top-down cognitive control processes inhibit intergroup bias.
- Sleep deprivation impairs cognitive control processes.
Purpose of the Study:
- To investigate whether sleep deprivation influences intergroup bias.
- To examine the moderating role of common ingroup identity on the relationship between sleep and intergroup bias.
Main Methods:
- Two studies were conducted, manipulating sleep duration (habitual short sleep vs. adequate sleep; one-night sleep deprivation vs. adequate sleep).
- Participants' levels of common ingroup identity and intergroup bias were measured.
Main Results:
- Common ingroup identity attenuated intergroup bias only when participants had adequate sleep.
- Sleep deprivation eliminated the bias-reducing effect of common ingroup identity, leading to high intergroup bias regardless of identity levels.
Conclusions:
- Sleep deprivation compromises motivated inhibition of intergroup bias.
- Findings highlight the crucial role of sleep in regulating social biases and offer insights for managing intergroup conflict.
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