Performance Decrement as a Function of Total Sleep Loss and Task Duration

1969 ◽  
Vol 29 (3) ◽  
pp. 711-714 ◽  
Author(s):  
Julie M. Donnell
Keyword(s):  
Baseline Level ◽  
Sleep Loss ◽  
Performance Decrement ◽  
Task Duration ◽  
Enlisted Men ◽  
Speed And Accuracy ◽  
And Task

To determine the effect of task duration and its sensitivity to total sleep loss, measures of speed and accuracy on the Wilkinson addition test were obtained from 11 Navy enlisted men for 4 baseline days and 2 days without sleep. The number of additions attempted decreased significantly from the baseline level after 10 min. of testing on the first deprivation day and after 6 min. on the second day. 50 min. of testing were required to detect a significant decrease in accuracy from baseline on the first deprivation day, while 10 min. were required on the second day.

Effects of Sensory Modality and Task Duration on Performance, Workload, and Stress in Sustained Attention

2004 ◽  
Vol 46 (2) ◽  
pp. 219-233 ◽  
Author(s):  
James L. Szalma ◽  
Joel S. Warm ◽  
Gerald Matthews ◽  
William N. Dember ◽  
Ernest M. Weiler ◽  
...  
Keyword(s):  
Sustained Attention ◽  
Sensory Modality ◽  
Task Duration ◽  
And Task

scholarly journals It’s about Time: Effects of Physical Exertion on Duration Estimates

2019 ◽  
Vol 4 (1) ◽  
pp. 6
Author(s):  
Britton W. Brewer ◽  
Lawrence O. Schwartz ◽  
Allen E. Cornelius ◽  
Judy L. Van Raalte ◽  
Edmundo L. Urbina ◽  
...  
Keyword(s):  
Physical Activity ◽  
High Intensity ◽  
Perceived Exertion ◽  
Physical Exertion ◽  
Fundamental Aspect ◽  
Time Effects ◽  
Task Duration ◽  
Low Intensity ◽  
D Values ◽  
And Task

Background: Task duration is a fundamental aspect of exercise, but little is known about how completed bouts of physical activity are perceived. Consequently, the purpose of the five experiments conducted for this investigation was to examine the effects of engaging in physical tasks on retrospective duration estimates with college student participants. Methods: Across the five experiments, participants were 113 college students (82 women, 31 men). In Experiments 1 and 2, participants provided duration estimates of a period spent engaging in physical activity or rest. In Experiments 3, 4, and 5, participants provided duration estimates of periods spent engaged in physical tasks of high intensity and low intensity. Results: In Experiments 1, 2, and 3, participants engaged in physical activity tended to perceive durations as shorter than participants at rest. When completing less familiar tasks (Experiments 4 and 5), however, participants recalled a high intensity bout of physical activity as lasting longer than a low intensity bout of physical activity of comparable duration. Cohen’s d values for physical activity effects on duration estimates ranged from 0.40 to 1.60. Conclusion: The findings, which partially support a contextual-change interpretation, suggest that factors, such as perceived exertion and task familiarity, affect retrospective duration estimates.

Effects of display curvature and task duration on proofreading performance, visual discomfort, visual fatigue, mental workload, and user satisfaction

2019 ◽  
Vol 78 ◽  
pp. 26-36 ◽  
Author(s):  
Sungryul Park ◽  
Gyouhyung Kyung ◽  
Donghee Choi ◽  
Jihhyeon Yi ◽  
Songil Lee ◽  
...  
Keyword(s):  
User Satisfaction ◽  
Mental Workload ◽  
Visual Fatigue ◽  
Visual Discomfort ◽  
Task Duration ◽  
And Task

scholarly journals ELDERLY DRIVER INGRESS AND EGRESS FROM A VEHICLE: PERCEIVED DISCOMFORT AND TASK DURATION

2018 ◽  
Vol 2 (suppl_1) ◽  
pp. 517-517
Author(s):  
K Kozak ◽  
P Mirshams Shahshahani ◽  
J Wan ◽  
N Wang ◽  
A Kapshai ◽  
...  
Keyword(s):  
Task Duration ◽  
Elderly Driver ◽  
And Task

Effects of Display Curvature, Presbyopia, and Task Duration on Visual Fatigue, Task Performance, and User Satisfaction

2018 ◽  
Vol 61 (2) ◽  
pp. 273-287 ◽  
Author(s):  
Donghee Choi ◽  
Gyouhyung Kyung ◽  
Kyunghyun Nam ◽  
Sungryul Park
Keyword(s):  
Task Performance ◽  
User Satisfaction ◽  
Pupil Diameter ◽  
Visual Display ◽  
Curvature Radius ◽  
Visual Fatigue ◽  
Visual Display Terminal ◽  
Task Duration ◽  
The Mean ◽  
And Task

Objective: This study examined the effects of display curvature, presbyopia, and task duration on visual fatigue, task performance, and user satisfaction. Background: Although curved displays have been applied to diverse display products, and some studies reported their benefits, it is still unknown whether the effects of display curvature are presbyopia-specific. Method: Each of 64 individuals (eight nonpresbyopes and eight presbyopes per display curvature) performed four 15-min proofreading tasks at one display curvature radius setting (600R, 1140R, 4000R, and flat; mm). Diverse measurements were obtained to assess visual fatigue, task performance, and user satisfaction. Results: The mean pupil diameter was the largest with 1140R, indicating this curvature radius was associated with the least development of visual fatigue; 600R was comparable with 1140R in terms of pupil diameter. The presbyopic group showed a 28.5% slower proofreading speed compared with the nonpresbyopic group, whereas their proofreading accuracy was comparable. For both groups, the mean visual fatigue increased significantly during the first 15 min of proofreading, as indicated by a decrease of 0.11 mm in the mean pupil diameter, an increase of 3.8 in the mean bulbar conjunctival redness, and an increase of 9.13 in the mean eye complaint questionnaire score. Conclusion: The effect of display curvature was not presbyopia-specific. Low visual fatigue was observed with 1140R and 600R. Application: Display curvature radii near or in the range of 600R and 1140R and frequent breaks are recommended for both presbyopic and nonpresbyopic groups to reduce their visual fatigue due to visual display terminal tasks.

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