The abbreviated vigilance task and cerebral hemodynamics.
Transcranial Doppler sonography (TCD) and transcranial cerebral oximetry (TCCO) measures of cerebral blood flow velocity and oxygenation levels were collected during an abbreviated 12-min vigilance task. Both the TCD and TCCO measures showed higher levels of cerebral vascular activity in the right than in the left cerebral hemisphere; the cerebral laterality of vigilance occurs in an abbreviated task. Although there was a significant decline in performance over time, there was no significant change in the physiological measures over time during the abbreviated vigil. This latter finding does not match the physiological changes detected in long-duration vigils.
Helton
William S
WS
Michigan Technological University, Houghton, MI 49931, USA. Deak_Helton@yahoo.com
Hollander
Todd D
TD
Warm
Joel S
JS
Tripp
Lloyd D
LD
Parsons
Kelley
K
Matthews
Gerald
G
Dember
William N
WN
Parasuraman
Raja
R
Hancock
Peter A
PA
D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001143:Arousal / Q000502:physiology*; D001921:Brain / Q000378:metabolism*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D010092:Oximetry / Q000379:methods; D010100:Oxygen / Q000097:blood* / Q000378:metabolism; D011930:Reaction Time / Q000502:physiology; D013647:Task Performance and Analysis; D017585:Ultrasonography, Doppler, Transcranial / Q000379:methods
D010100:Oxygen