title: Human infants detect other people's interactions based on complex patterns of kinematic information.
abstract: Do infants perceive other people's interactions by means of a mechanism that integrates biological motion information across the observed individuals? In support of this view, the present study demonstrates that infants (N = 28, Age  = 14 months) discriminate between point light displays representing disrupted and non-disrupted interactions between people, even though the two interaction types are identical at the level of individual point light agents. Moreover, a second experiment (sample 2: N = 28, Age  = 14 months) indicated that visual preference in this context is influenced by an audiovisual integration processes that takes into account the presence of an interaction between people. All these results were found exclusively for upright displays--when stimuli were shown upside-down (disrupting biological motion processing), performance was random. Collectively, these findings point to an important role for biological motion in social perception in human infants.
authors.affiliation: Uppsala Child and Babylab, Department of Psychology, Uppsala University, Uppsala, Sweden.
authors.forename: Martyna A
authors.initials: MA
authors.lastname: Galazka
authors.affiliation: Institut National de la Santé et de la Recherche Médicale (INSERM), Unit 930, Tours, France; University François-Rabelais of Tours, Unit 930 'Imaging et Brain' - Team 1 Autism, Tours, France.
authors.forename: Laëtitia
authors.initials: L
authors.lastname: Roché
authors.affiliation: Uppsala Child and Babylab, Department of Psychology, Uppsala University, Uppsala, Sweden.
authors.forename: Pär
authors.initials: P
authors.lastname: Nyström
authors.affiliation: Center of Neurodevelopmental Disorders at Karolinska Institutet (KIND), Stockholm, Sweden; Uppsala Child and Babylab, Department of Psychology, Uppsala University, Uppsala, Sweden.
authors.forename: Terje
authors.initials: T
authors.lastname: Falck-Ytter
mesh_terms: D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007223:Infant; D007398:Interpersonal Relations; D008297:Male; D009068:Movement; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation; D012938:Social Perception