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Investigating the modality specificity of response selection using a temporal flanker task.

Eric H Schumacher1, Hillary Schwarb, Erin Lightman

  • 1School of Psychology, Georgia Institute of Technology, 654 Cherry Street, Atlanta, GA 30332, USA. eschu@gatech.edu

Psychological Research
|August 30, 2011
PubMed
Summary
This summary is machine-generated.

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Response selection involves distinct brain networks that vary by input modality. This study shows that visual and auditory stimuli activate different neural pathways during this cognitive process.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • The neurocognitive basis of response selection remains debated, with theories proposing either a single central mechanism or multiple independent control systems.
  • Understanding how stimulus modality influences these mechanisms is crucial for elucidating the brain's executive functions.

Purpose of the Study:

  • To investigate the neural mechanisms of response selection and how they are affected by stimulus modality (visual vs. auditory).
  • To test the hypothesis of partially independent brain networks for response selection, organized by input modality.

Main Methods:

  • A modified flanker task was employed, using stimuli that differed temporally rather than spatially, allowing for both visual and auditory presentation.
  • Functional neuroimaging (fMRI) was used to examine brain activation patterns during the task.

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Last Updated: May 29, 2026

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  • Behavioral data (reaction times) and brain activity were analyzed for congruency and modality effects.

    • Main Results:

    • A congruency effect (slower reaction times for incongruent trials) was observed in both visual and auditory modalities.
    • Brain activation related to congruency was found in prefrontal cortex, parietal cortex, and the putamen for both modalities.
    • Modality-specific activation patterns were identified in prefrontal and parietal regions (visual) and left inferior prefrontal cortex (auditory).
    • Modality-dependent activity linked to response congruency was also observed in sensory cortical regions.

    Conclusions:

    • Stimulus modality influences the cortical brain regions involved in response selection, even for conceptually similar tasks.
    • The findings support the hypothesis that response selection is mediated by partially independent neural networks.
    • Input modality plays a significant role in organizing neural activity to support task performance.