Smiling in newborns during communicative wake and active sleep

The Duchenne smile: Emotional expression and brain physiology: II.

Paul Ekman, Richard J. Davidson, Wallace V. Friesen · Journal of Personality and Social Psychology · 1990 · 1.3K citations

Social Sciences, Neuroscience, Psychology +16

Facial Action Coding System (FACS)

Paul Ekman · Medical Entomology and Zoology · 2002 · 396 citations

Social Sciences, Behavioral Sciences, Neuroscience +11

Developmental Course of Nighttime Sleep-Wake Patterns in Full-Term and Premature Infants During the First Year of Life. I.

Thomas F. Anders, Marcia A. Keener · SLEEP · 1985 · 313 citations

Life Sciences, Human Development, Pediatrics +17

Developmental Changes in the Relationship Between the Infant's Attention and Emotion During Early Face-to-Face Communication: The 2-Month Transition.

Manuela Lavelli, Alan Fogel · Developmental Psychology · 2005 · 225 citations

Education, Human Development, Psychology +17

All smiles are positive, but some smiles are more positive than others.

Daniel S. Messinger, Alan Fogel, K. Laurie Dickson · Developmental Psychology · 2001 · 183 citations

Social Sciences, Psychology, Social Psychology +3