title: Effects of regular or irregular event schedules on cerebral hemovelocity during a sustained attention task.
abstract: Transcranial Doppler sonography was used to measure bilateral cerebral blood flow velocity during sustained attention task performance where the background event schedule occurred in a synchronous (temporally regular) or asynchronous (temporally irregular) manner. Perceptual sensitivity was greater in the synchronous case and declined over time in both conditions. Blood flow velocity was greater in the more difficult asynchronous condition and declined over time in both conditions in the right hemisphere, but the decline in blood flow velocity was limited to the asynchronous condition in the left hemisphere. The results are interpreted in terms of a resource model of sustained attention.
authors: Human Factors and Applied Cognition, George Mason University, Fairfax, VA, USA. tshaw4@gmu.edu
authors: Tyler
authors: T
authors: Shaw
authors: Victor
authors: V
authors: Finomore
authors: Joel
authors: J
authors: Warm
authors: Gerald
authors: G
authors: Matthews
mesh_terms: D000293:Adolescent; D000328:Adult; D001143:Arousal; D001288:Attention; D001783:Blood Flow Velocity; D002540:Cerebral Cortex / Q000000981:diagnostic imaging / Q000503:physiopathology*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009483:Neuropsychological Tests; D017603:Signal Detection, Psychological; D018709:Statistics, Nonparametric; D017585:Ultrasonography, Doppler, Transcranial; D055815:Young Adult