title: Infant timekeeping: attention and temporal estimation in 4-month-olds.
abstract: Four-month-old infants were exposed to sequences in which a 2-s light stimulus alternated with dark interstimulus periods whose length was manipulated to be 3 or 5 s. A predictable on-off pattern occurred for eight trials, but the light stimulus was omitted on the ninth trial. Infants showed heart rate responses on the omission trial that were closely synchronized with the expected recurrence of the stimulus. In addition, these heart rate patterns were observed predominantly in infants who had previously shown high levels of sustained attention in pretests with visual stimuli. These findings indicate remarkable precision in infants' estimation of time intervals, and suggest that the link between time estimation and attentional processes is present in early infancy.
authors.affiliation: Department of Psychology, University of Kansas, Lawrence 66045-7556, USA. colombo@ku.edu
authors.forename: John
authors.initials: J
authors.lastname: Colombo
authors.forename: W Allen
authors.initials: WA
authors.lastname: Richman
mesh_terms: D001143:Arousal; D001288:Attention; D004193:Discrimination Learning; D005260:Female; D006339:Heart Rate; D006801:Humans; D007223:Infant; D008297:Male; D010775:Photic Stimulation; D002666:Psychology, Child; D013998:Time Perception