Observed the behavior of 37 infants in response to their mothers' normal and still face. Infants reduced their smiling and increased their gazing away from mother during the still face condition compared to normal face condition. Compared to three month olds, six month olds were more likely to use hand activities while gazing away from mother. (MM)

Compared Duchenne and non-Duchenne smiles of 1- to 6-month olds during weekly videotapes of mother/infant interaction for clues regarding emotional significance. Correlated levels of Duchenne and non-Duchenne smiling within sessions; found that they had similar developmental trajectories. Duchenne smiles were typically preceded by non-Duchenne…