Approach-withdrawal and cerebral asymmetry: Emotional expression and brain physiology: I.
Richard J. Davidson
,
Paul Ekman
,
Clifford D. Saron
,
Richard J. Davidson
,
Paul Ekman
,
Clifford D. Saron
,
Joseph A. Senulis
,
Wallace V. Friesen
1990
Journal of Personality and Social Psychology
1,595 citations