CEA Cognitive Ergonomics & Mental Workload 2 — Questions and Answers
Question 1: Decision fatigue in the workplace is best described as:
- Deterioration in decision quality after making a large number of decisions over an extended period (Correct answer)
- Physical exhaustion that prevents workers from operating machinery safely
- A nutritional deficiency causing impaired judgment on night shifts
- Inability to navigate decision-support software interfaces
Correct answer: Deterioration in decision quality after making a large number of decisions over an extended period
Decision fatigue occurs because repeated decision-making depletes mental resources, leading to poorer choice quality, impulsive decisions, or decision avoidance over time.
Question 2: In cognitive ergonomics, 'chunking' is a strategy that reduces mental workload by:
- Grouping individual pieces of information into meaningful units that can be processed as single items (Correct answer)
- Breaking complex tasks into shorter time intervals with mandatory rest breaks
- Assigning cognitive tasks to automated systems instead of human operators
- Reducing the total number of work tasks assigned to each employee
Correct answer: Grouping individual pieces of information into meaningful units that can be processed as single items
Chunking consolidates multiple items into a single meaningful unit (e.g., a phone number as one chunk rather than ten digits), reducing the load placed on working memory.
Question 3: Automation complacency is a cognitive hazard that occurs when:
- Operators over-rely on automated systems and reduce active monitoring, increasing risk of missing failures (Correct answer)
- Workers refuse to adopt new automated equipment due to technophobia
- Automated systems fail due to insufficient maintenance schedules
- Management relies solely on automated safety reports without conducting field audits
Correct answer: Operators over-rely on automated systems and reduce active monitoring, increasing risk of missing failures
Automation complacency develops when perceived reliability of an automated system reduces operator vigilance, creating risk when the system fails or produces incorrect outputs.
Question 4: How does a 'mistake' in Reason's error classification differ from a 'slip'?
- A mistake involves a flawed plan or intention, whereas a slip involves correct intention but faulty execution (Correct answer)
- A mistake is always deliberate, whereas a slip is always accidental
- Mistakes only occur in novice workers, while slips are exclusive to experienced workers
- Mistakes involve physical errors while slips involve cognitive errors only
Correct answer: A mistake involves a flawed plan or intention, whereas a slip involves correct intention but faulty execution
A mistake is a knowledge- or rule-based error where the intention itself is wrong (wrong plan), while a slip is an execution failure despite a correct intention (right plan, wrong action).
Question 5: The vigilance decrement phenomenon describes:
- A decline in detection performance during sustained, monotonous monitoring tasks over time (Correct answer)
- A gradual reduction in workplace injury rates following an ergonomics program
- Decreased auditory sensitivity resulting from chronic noise exposure
- Reduced visual acuity experienced under low-luminance working conditions
Correct answer: A decline in detection performance during sustained, monotonous monitoring tasks over time
Vigilance decrement is the well-documented degradation in signal detection performance that occurs during prolonged monitoring of low-event-rate environments.
Question 6: Which design feature best supports error recovery in cognitively demanding control environments?
- Reversible actions with clear undo or cancel functions that allow correction without serious consequences (Correct answer)
- Maximizing information density on displays to provide all data simultaneously
- Removing confirmatory dialogs to speed up operator response times
- Restricting access to system override functions to prevent unauthorized changes
Correct answer: Reversible actions with clear undo or cancel functions that allow correction without serious consequences
Reversible actions implement error-tolerant design by allowing operators to undo or cancel unintended inputs before they cause irreversible consequences.
Question 7: Prospective memory in occupational settings refers to:
- The cognitive function of remembering to perform a planned action at a specific future time or triggering event (Correct answer)
- Recalling past incidents accurately for safety investigation reports
- Forward planning of physical workplace layout and ergonomic modifications
- Using predictive analytics software to anticipate future ergonomic risks
Correct answer: The cognitive function of remembering to perform a planned action at a specific future time or triggering event
Prospective memory is the ability to form an intention and remember to execute it at the appropriate future moment—for example, remembering to check a valve setting after completing another task.
CEA Cognitive Ergonomics & Mental Workload 2
Decision fatigue in the workplace is best described as: