Lecture 10 'Mental Workload' Flashcards Preview

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Flashcards in Lecture 10 'Mental Workload' Deck (16):

Time-based measures is an example of what type of method to determine mental workload?



What are the three types of empirical methods of determining mental workload?

> Cooper-Harper scale
> NASA Task Load Index
> Air Traffic Workload Input Technique


Levels of cognitive "occupancy" influences what four factors in workers?

> Prevents performance
> Changes control/performance standard
> Threatens prospective memory for tasks
> Emotional impact


(Q 52). Mental workload is usually associated with limits in the amount of time to perform a task. Can we derive reliable and valid workload estimates from a timeline analysis of workers’ tasks?

No, because workers’ covert tasks, task management strategies, and level of skill will affect


According to the Contextual Control Model, change of "control mode" as workload changes in what four ways?

1. Strategic = actions chosen after full consideration

2. Tactical = actions are routine but panning limited

3. Opportunistic = actions inefficient and selection incomplete

4. Scrambled = actions seem random and not based on current situation


(Q 53) Which of the following is not one of the usual methods of measuring mental workload?

a. Subjective rating scales.
b. Observer rating scales.
c. Secondary task performance.
d. Primary task performance.

b) Observer is NOT


(Q55) What is the basis of Nygren’s (1991) critique of the NASA Task Load Index?

Weighting the ratings by the relative subjective importance of the subscales provides no further precision to the scale


(Q. 56.) According to Loft et al.’s (2007) review of the mental workload of air traffic controllers, what is the
most effective way of understanding the workload of air traffic controllers (ATCos)?

Investigate how ATCos adapt their work strategies to the current demands of their tasks.


(Q. 57.) What is the best description of the current status of the NASA Task Load Index?

Widely used in many countries in many different investigative contexts.


Why can't we just perform a timeline analysis and derive workload estimates, what are six difficulties that need to be considered?

1. Need to measure or estimate duration of tasks
2. Need to know duration of overt and covert tasks
3. Need to take into account task management strategies (priorotisation)
4. Need to know task resource demands + automaticity
5. Need to take into account resource demands
6. Need to consider whether multiple resource demand allows timesharing


What are the four empirical methods of measuring mental workload?

> Primary task performance
> Secondary task performance
> Physiological measures
> Subjective rating scales


What type of mental workload empirical measure was used to test pilot handling qualities of a new aircraft?

Cooper-Harper Scale


What are the two components of the NASA Task Load Index?

1. Optional preliminary subscale RANKING phase
2. Subscale RATING phase


(Q. 54) What are the six subscales of the NASA Task Load

1. Mental demand
2. Physical demand
3. Temporal demand
4. Effort
5. Own performance
6. Frustration level


How is mental workload calculated in the NASA-TLX?

Multiply ratings by the scaled rankings (result is weighted workload score)


In Sperandio (1971)'s study on how ATCo controls their workload, what were the results?

They adaptively controlled their desired workload like a closed-loop process
(desired workload = +/- > strategy > task demands > actual workload