Stop touching your face! A systematic review of triggers, characteristics, regulatory functions and neuro-physiology of facial self touch

• Published in: Neuroscience and biobehavioral reviews Vol. 128; pp. 102 - 116
• Main Authors: Spille, Jente L., Grunwald, Martin, Martin, Sven, Mueller, Stephanie M.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Ltd 01-09-2021
• Subjects: Attention; Attention focus; Emotion regulation; Face; Hand; Humans; Infection transmission; Nonverbal communication; Sensory attenuation; Tic disorder; Touch; Touch Perception; Trigeminal nerve; Working memory; Attention focus; Trigeminal nerve; Nonverbal communication; Sensory attenuation; Working memory; Tic disorder; Emotion regulation; Infection transmission
• ISSN: 0149-7634; 1873-7528
• DOI: 10.1016/j.neubiorev.2021.05.030

•Spontaneous face touching is associated with cortical regulatory processes.•Self touch count and duration increase with arousal, emotional or cognitive load.•Active prevention of face touching to reduce infections requires mental effort.•Association of face touch with trigeminal communicating rami is discussed.•Fundamental mechanisms and functions of spontaneous face touches remain unknown.
Spontaneous face touching (sFST) is an ubiquitous behavior that occurs in people of all ages and all sexes, up to 800 times a day. Despite their high frequency, they have rarely been considered as an independent phenomenon. Recently, sFST have sparked scientific interest since they contribute to self-infection with pathogens. This raises questions about trigger mechanisms and functions of sFST and whether they can be prevented. This systematic comprehensive review compiles relevant evidence on these issues. Facial self-touches seem to increase in frequency and duration in socially, emotionally as well as cognitively challenging situations. They have been associated with attention focus, working memory processes and emotion regulating functions as well as the development and maintenance of a sense of self and body. The dominance of face touch over other body parts is discussed in light of the proximity of hand-face cortical representations and the peculiarities of facial innervations. The results show that underlying psychological and neuro-physiological mechanisms of sFST are still poorly understood and that various basic questions remain unanswered.