Lecture 18 Flashcards
What does human factors/ergonomics look at?
- Concerned with understanding interactions among humans and other elements of a system
- Looks to optimise human wellbeing and overall system performance
What is vigilance?
The ability to maintain attentional focus and remain alert over prolonged periods
What are the requirements for a task to be considered a vigilance task?
- Participants required to monitor at least one formation source
- For a prolonged period of time
What Performance measures are combined to obtain signal detection measures?
HIT and FALSE ALARM
What is the performance outcome if there is a target present and the participant responds?
HIT
-number of correct responses worked as a %
What is the performance outcome if there is a target present and the participant doesn’t respond?
MISS - Error of Omission
-Target appeared and they didn’t respond
What is the performance outcome if there is a distractor present and the participant responds?
FALSE ALARM - Error of Commission
-Made response when they shouldn’t have
What is the performance outcome if there is a distractor present and the participant doesn’t respond?
CORRECT REJECTION
-See if people will withhold their response
What is perceptual sensitivity a measure of?
Overall sensitivity
What is the effect of less frequent occurrence of the actual target?
People are less likely to identify the item as they are unprepared to see it
What are ways to reducing miss rates?
- Increase actual target prevalence - not very feasible
- False feedback - ‘You missed one’
- Artificially increase prevalence - fake targets
How does time spend doing the task affect detection performance?
Detection performance declines over time on the task
When does automation improve vigilance performance?
When it highlights possible targets
- Direct cue = gives specific location
- Highly reliable (minimise false alarms)
