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Content-specific codes of parametric auditory working memory in humans.

Işıl Uluç1, Timo Torsten Schmidt2, Yuan-Hao Wu1

  • 1Neurocomputation and Neuroimaging Unit (NNU), Department of Education and Psychology, Freie Universität Berlin, 14195 Berlin, Germany; Berlin School of Mind and Brain, Humboldt-Universität zu Berlin, 10099 Berlin, Germany.

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The brain

Keywords:
Abstract quantityAcoustic flutterAuditoryFrequency discriminationMVPAParametricVibrotactileWorking memoryfMRI

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Frontal brain regions parametrically encode frequency information during working memory.
  • This frequency representation is modality-independent, suggesting supramodal processing in frontal regions.
  • Previous studies show overlapping networks for visual and tactile frequency maintenance.

Purpose of the Study:

  • To investigate the representation of auditory frequency information in working memory.
  • To determine if auditory frequency processing involves the same frontoparietal network as other modalities.
  • To explore modality-independent coding of frequency in the prefrontal cortex.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to record brain activity.
  • Multivariate pattern analysis (MVPA) with support vector regression was applied to fMRI data.
  • Auditory and vibrotactile frequency maintenance tasks were conducted.

Main Results:

  • Working memory for auditory frequency information was found in auditory association areas and a frontoparietal network.
  • A direct comparison with vibrotactile working memory revealed overlapping information coding in prefrontal regions.
  • Specifically, the right inferior frontal gyrus showed shared coding for auditory and tactile frequency.

Conclusions:

  • The prefrontal cortex maintains frequency-specific working memory content in a modality-independent manner.
  • This extends previous findings to include the auditory domain, reinforcing the supramodal nature of frequency representation.
  • The right inferior frontal gyrus is a key region for this supramodal frequency representation.