Are individual differences in fatigue vulnerability related to baseline differences in cortical activation?
Recent evidence suggests that underlying patterns of cortical activation may partially account for individual differences in susceptibility to the effects of sleep deprivation. Here, functional magnetic resonance imaging (fMRI) was used to examine the activation of military pilots whose sleep-deprivation vulnerability previously was quantified. A Sternberg Working Memory Task (SWMT; S. Sternberg, 1966) was completed alternately with a control task during a 13-min blood oxygen level-dependent fMRI scan. Examination of the activated voxels in response to SWMT indicated that, as a group, the pilots were more similar to fatigue-resistant nonpilots than to fatigue-vulnerable nonpilots. Within the pilots, cortical activation was significantly related to fatigue vulnerability on simulator-flight performance. These preliminary data suggest that baseline fMRI scan activation during a working memory task may correlate with fatigue susceptibility.
Aviation Sustained Operations Research, U.S. Air Force Research Laboratory, Brooks City-Base, TX 78235, USA. john.caldwell@brooks.af.mil
John A
JA
Caldwell
Qiwen
Q
Mu
Jennifer K
JK
Smith
Alexander
A
Mishory
J Lynn
JL
Caldwell
Gordon
G
Peters
David L
DL
Brown
Mark S
MS
George
D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001931:Brain Mapping; D003198:Computer Simulation; D005221:Fatigue / Q000503:physiopathology*; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D007206:Individuality; D008279:Magnetic Resonance Imaging / Q000379:methods; D008570:Memory, Short-Term / Q000502:physiology*; D008875:Middle Aged; D008889:Military Personnel; D010100:Oxygen / Q000097:blood; D017397:Prefrontal Cortex / Q000098:blood supply / Q000503:physiopathology*; D011930:Reaction Time / Q000502:physiology; D012892:Sleep Deprivation / Q000503:physiopathology; D013223:Statistics as Topic; D013647:Task Performance and Analysis; D013997:Time Factors; D014851:Wakefulness / Q000502:physiology
D010100:Oxygen