Send to

Choose Destination
Neuropsychology. 1998 Oct;12(4):526-32.

Asymmetrical hemispheric activation and behavioral persistence: effects of unilateral muscle contractions.

Author information

Department of Psychology, University of Toronto, Ontario, Canada.


Contractions of the left hand and of the left side of the lower third of the face induce negative emotional states whereas right-sided contractions induce positive states. Contractions also have mood-congruent influences on perception. This article reports that contractions affect behavior as well. Persistence in attempting to solve insoluble problems is greater following right-sided contractions than following left-sided contractions. This effect is unrelated to dominance of the contracted muscles because right-handed individuals tend to be left-face dominant. Results support the hypothesis that unilateral contractions activate the contralateral cerebral hemispheres and arouse the hemispheres' respective functions with regard to emotion and behavior.

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for American Psychological Association
Loading ...
Support Center