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Contagious itch: what we know and what we would like to know
C Schut1, S Grossman2, U Gieler3
1Department of Dermatology and Temple Itch Center, Temple University School of Medicine Philadelphia, PA, USA ; Institute of Medical Psychology, Justus-Liebig-University Giessen, Germany.
Frontiers in Human Neuroscience
|February 27, 2015
Summary
Contagious itch, triggered by visual cues like scratching, affects all humans. Patients with atopic dermatitis (AD) are more susceptible, and personality traits influence itch responses.
Area of Science:
- Psychology
- Neuroscience
- Dermatology
Background:
- Itch is a common human sensation, with contagious itch (triggered by observing others scratch) being a frequent phenomenon.
- Visual stimuli such as videos of scratching or images of affected skin can induce itch in both healthy individuals and chronic itch patients.
- Previous research indicates that patients with atopic dermatitis (AD) exhibit heightened susceptibility to visual itch cues compared to healthy controls.
Purpose of the Study:
- To explore the mechanisms and triggering factors of contagious itch.
- To investigate the role of personality traits in susceptibility to induced itch and scratching.
- To summarize current knowledge and propose future research directions for contagious itch.
Main Methods:
- Studies involved exposing healthy participants and chronic itch patients to visual stimuli (videos, images).
- Assessment of itch and scratching responses.
- Correlation analysis between itch susceptibility and personality traits (agreeableness, public self-consciousness, neuroticism).
Main Results:
- Patients with atopic dermatitis (AD) were more susceptible to visual itch cues than healthy subjects.
- Specific personality traits were associated with induced scratching (agreeableness, public self-consciousness) and induced itch (neuroticism) in different groups.
- Limited data exists on brain activation mechanisms underlying contagious itch.
Conclusions:
- Contagious itch is a complex phenomenon influenced by visual cues, individual susceptibility (e.g., AD), and personality traits.
- Mirror neuron systems are hypothesized to play a role in the imitation of actions and negative affect, potentially underlying contagious itch.
- Further research is needed to fully understand the physiological reactions and brain mechanisms involved in contagious itch.
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