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More Than the Verbal Stimulus Matters: Visual Attention in Language Assessment for People With Aphasia Using

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Visual characteristics of images significantly impact language comprehension tasks for people with aphasia (PWA). These visual factors can influence attention, affecting how PWA perform on tests, even with verbal cues.

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Area of Science:

  • Neurolinguistics
  • Cognitive Psychology
  • Speech and Language Pathology

Background:

  • Aphasia frequently impairs language comprehension.
  • Standard assessments use multiple-choice image displays, assuming image choice reflects linguistic understanding.
  • Visual characteristics of images may confound comprehension assessment in people with aphasia (PWA).

Purpose of the Study:

  • To investigate how physical image characteristics influence visual attention in PWA during comprehension tasks.
  • To determine if visual stimulus properties affect PWA's performance independently of verbal stimuli.

Main Methods:

  • Recorded eye fixations of 41 PWA viewing image sets with and without verbal stimuli.
  • Compared fixation duration on singleton images (visually distinct) versus majority images (visually similar).
  • Analyzed attention allocation based on image characteristics and aphasia severity.

Main Results:

  • PWA consistently allocated more fixation time to singleton images than majority images, regardless of verbal stimuli.
  • Increased attention to nontarget singleton images occurred in the verbal condition for PWA with severe comprehension deficits.
  • Visual stimulus characteristics significantly influence attention allocation in PWA.

Conclusions:

  • Verbal stimuli may not always override the influence of visual characteristics in multiple-choice tasks for PWA.
  • Assessment methods should account for visual salience to accurately measure language comprehension in aphasia.
  • Future research should consider visual design in aphasia testing protocols.