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Characterizing the Visual Cortex Function in Cognitive Task-Induced Mental Load: An Functional Magnetic Resonance

Monireh Mahjoob1, Javad Heravian Shandiz2, Ali Mirzajani3

  • 1Health Promotion Research Center, Department of Optometry, Rehabilitation Sciences Faculty, Zahedan University of Medical Sciences, Zahedan, Iran.

Brain Connectivity
|February 22, 2024
PubMed
Summary
This summary is machine-generated.

Simultaneous cognitive tasks reduce visual cortex activity, impacting visual processing. This mental load, especially with auditory n-back and arithmetic tasks, decreases active brain voxels in visual areas.

Keywords:
N-back taskarithmetic tasktask-fMRItask-induced mental loadvisual stimuli

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Multitasking and mental load can impair visual information processing.
  • Understanding the neural mechanisms of cognitive load on visual perception is crucial.

Purpose of the Study:

  • To investigate how mental load from concurrent cognitive tasks affects visual cortex activation.
  • To examine the impact of auditory n-back and arithmetic tasks on visual processing.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) in 22 healthy adults.
  • Comparison of visual cortex activity during a visual task alone versus with an auditory n-back or arithmetic task.
  • Presentation of Gabor patches at varying spatial frequencies (0.25, 4, 9 cpd).

Main Results:

  • Mental load significantly reduced activated voxels in visual cortex areas.
  • The reduction was more pronounced at 0.25 cpd for the n-back task and 9 cpd for the arithmetic task.
  • The amygdala showed increased activity during the cognitive tasks.

Conclusions:

  • Concurrent cognitive tasks impose a mental load that diminishes visual cortex activation.
  • Findings support previous psychophysical studies on the effects of cognitive load on visual perception.