title: Developmental asymmetries between horizontal and vertical tracking.
abstract: The development of the asymmetry between horizontal and vertical eye tracking was investigated longitudinally at 5, 7, and 9 months of age. The target moved either on a 2D circular trajectory or on a vertical or horizontal 1D sinusoidal trajectory. Saccades, smooth pursuit, and head movements were measured. Vertical tracking was found to be inferior to horizontal tracking at all age levels. The results also show that the mechanisms responsible for horizontal and vertical tracking mutually influence one another in the production of 2D visual pursuit. Learning effects were observed within-trials but no transfer between trials was found.
authors.affiliation: Department of Psychology, Uppsala University, Box 1225, SE-75142 Uppsala, Sweden. helena.gronqvist@psyk.uu.se
authors.forename: Helena
authors.initials: H
authors.lastname: Grönqvist
authors.forename: Gustaf
authors.initials: G
authors.lastname: Gredebäck
authors.forename: Claes von
authors.initials: Cv
authors.lastname: Hofsten
mesh_terms: D002657:Child Development / Q000502:physiology*; D005133:Eye Movements / Q000502:physiology*; D005260:Female; D019416:Head Movements / Q000502:physiology; D006801:Humans; D007223:Infant; D007858:Learning / Q000502:physiology; D008297:Male; D009039:Motion Perception / Q000502:physiology; D010775:Photic Stimulation; D011698:Pursuit, Smooth / Q000502:physiology; D012438:Saccades / Q000502:physiology; D013997:Time Factors; D014785:Vision, Ocular / Q000502:physiology*