Effects of Memory Load and Test Position on Short-Duration Sustained Attention Tasks.

Area of Science:

• Cognitive Psychology
• Human Factors Engineering

Background:

• Sustained attention and workload are critical in complex environments.
• Understanding task position effects in cognitive batteries is essential for accurate assessment.

Purpose of the Study:

• To examine sustained attention performance and perceived workload using a dual-task.
• To investigate the impact of task position within a multi-instrument battery.

Main Methods:

• Experiment 1: Modified a dual-task working memory and vigilance task (Helton & Russell, 2011).
• Experiment 2: Modified the dual-task to emphasize attention over working memory.
• Assessed performance (sensitivity index A', reaction time variability) and workload (NASA-TLX).

Main Results:

• Experiment 1: No significant sensitivity decrement; test position had minimal influence.
• Experiment 2: Significant performance decline in sensitivity (A') across the vigil.
• Task position affected reaction time variability and workload, with later positions showing poorer performance and higher workload.

Conclusions:

• Task design (attention vs. working memory focus) influences sustained attention.
• The position of vigilance tasks within a battery significantly impacts performance and perceived workload.
• Findings have implications for designing cognitive assessment batteries and understanding vigilance decrements.