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Flashcards in Stress and Workload Deck (13):

Different types of stress and stressors

1. Physical (vibration, fatigue)
2. Physiological (frustration)
3. Psychological (time pressure)
4. Environmental (heat)


Direct stressors

Influence cognitive performance immediately


Indirect stressors

Stressors whose affect cannot be directly observed


Environmental stressors

1. Motion
2. Thermal
3. Air quality


Psychological stressors

Subjective definition of a stressors; confidence of their ability to handle it; dependent on someones understanding of the situation


Level of arousal

There is an inverted U shaped correlation (Yerkes-Dodson law) between stressors and performance that creates an optimum level of arousal. It also depends on task complexity.


Overarousal effects

1. Cognitive tunneling (tunnel vision)
2. Working memory loss
3. Strategic shifts to a speed-accuracy trade off


Life stress

Stress caused by life that decreases performance in life.


Timeline model of workload

A ratio of the time required to do a task and the time available to do the task plotted over time to see if stressors are consistently and cyclically occurring.


Mental workload model

A ratio of the mental resources required and the mental resources available. Same as timeline, but with cognitive demand.


Mental fatigue

High and moderate mental workload deficit buildup over time. It leads to physical and cognitive performance decreases. Unable to sustain at same energy and fidelity as before.


Vigilance and under arousal

Being under stimulated can cause the same type of fatigue as overloading. It can be caused from the time on the task, event salience, signal rate and arousal level.


Sleep deprivation

Difficult to maintain attention, physical degradation, the whole works.