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Contrast discrimination under task-induced mental load.

Monireh Mahjoob1, Andrew J Anderson2

  • 1Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran.

Vision Research
|November 4, 2019
PubMed
Summary
This summary is machine-generated.

Auditory cognitive tasks increase mental load, significantly raising contrast discrimination thresholds across all spatial frequencies. This impacts visual performance, particularly in real-world scenarios like driving.

Keywords:
Contrast discrimination thresholdN-back taskTask-induced mental load

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Area of Science:

  • Visual perception
  • Cognitive psychology
  • Human factors

Background:

  • Task-induced mental load can impair visual performance, crucial for activities like driving.
  • Contrast discrimination, not absolute detection, is key for distinguishing objects in natural environments.

Purpose of the Study:

  • To investigate how auditory task-induced mental load affects contrast discrimination thresholds at various spatial frequencies.

Main Methods:

  • Binocular contrast discrimination thresholds were measured in 14 participants.
  • Tested at spatial frequencies of 0.25, 1, 4, 8, 14 cpd and contrast levels of 10-60%.
  • Auditory 0-back and 2-back tasks were used to induce mental load, with subjective ratings and heart rate recorded.

Main Results:

  • A concurrent 2-back task significantly elevated contrast discrimination thresholds across all tested spatial frequencies.
  • Compared to baseline and 0-back conditions, the 2-back task showed a significant increase in thresholds.
  • Mental load did not significantly affect the slope of the Threshold vs Contrast function after accounting for potential ceiling effects.

Conclusions:

  • Concurrent cognitive tasks inducing mental load can heighten contrast discrimination thresholds.
  • These findings highlight the importance of considering mental load's impact on visual performance in real-world tasks like driving.