Operator State: stress, workload, fatigue, distraction (Wk17)

stressors definition

something that stressess mind or body

psychological stressors

produce a subjective psychological experience or change

negative effects stressors

task performance, health

environmental stressors examples

air quality, temperature, motion/vibration

psychological stressors examples

overload, life stress, sleep disruption, threats

arousal definition

psychological state of being awake and alert

yerkes-dodson law

quality of performance is an inverted u-shaped function of arousal

fatigue

transition state between alertness and somnolence

effect of fatigue

reduced vigilance

designing good vigilance

sustain arousal, more salient, false signals

effects of high arousal

strategic shifts in behaviour, wm loss, narrowed attention

workload definition

demand placed on humans

workload equation

time required/available (tr/ta)

effective workload condition

tr/ta less than 0.8

psychological measures (workload)

pupil diameter, eye movements, heart rate variability

subjective measures (workload)

task load index

primary measures (workload)

speed, accuracy

secondary task measures (workload)

mental arithmetic, reaction time tasks

impact (distraction)

delay in recognition of information to perfrom task successfully

agent (distraction)

event, object, person

mechanism (distraction)

shifting attention from task

type (distraction)

auditory, biomechanical, cognitive, visual

causes of distraction

motivation discomfort trade-off, automated distracting behaviours