Editing Facial expression (section)

=== Asymmetries ===
The lower portions of the face are controlled by the opposite [[cerebral hemisphere]], causing asymmetric facial expression. Because the [[right hemisphere]] is more specialised for [[emotional expression]], emotions are more strongly expressed on the left side of the face,<ref>{{cite journal|author=Blonder LX, Bowers D, Heilman KM|year=1991|title=The role of right hemisphere in emotional communication|journal=Brain|volume=114|issue=3|pages=1115–1127|doi=10.1093/brain/114.3.1115|pmid=2065243}}</ref> particularly for [[negative affectivity|negative emotions]].<ref>{{cite journal|author=Ahern GL, Schwartz GE|year=1979|title=Differential lateralization for positive versus negative emotion|journal=Neuropsychologia|volume=17|issue=6|pages=693–698|doi=10.1016/0028-3932(79)90045-9|pmid=522984|s2cid=27771100}}</ref> [[Asymmetries]] in expression can be seen in chimeric faces (facial portraits made by combining the left and right halves of faces with different expressions)<ref>{{cite journal|author=Levy J, Heller W, Banich MT, Burton LA|year=1983|title=Asymmetry of Perception in Free Viewing of Chimeric Faces|journal=Brain and Cognition|volume=2|issue=4|pages=404–419|doi=10.1016/0278-2626(83)90021-0|pmid=6546034|s2cid=21456608}}</ref> and also in [[portraits]] which more often show the left, more emotional side of the face than the right.<ref>{{cite journal|author=Nicholls Mike, Clode D, Wood SJ and Wood AG|year=1999|title=Laterality of expression in portraiture: Putting your best cheek forward|journal=Proceedings of the Royal Society B|volume=266|issue=1428|pages=1517–1522|doi=10.1098/rspb.1999.0809|pmid=10467743|pmc=1690171}}</ref>