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Related Experiment Video

Updated: Jul 28, 2025

Translational Brain Mapping at the University of Rochester Medical Center: Preserving the Mind Through Personalized Brain Mapping
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Mapping cortical activations underlying covert and overt language production using high-density diffuse optical

Mariel L Schroeder1, Arefeh Sherafati2, Rachel L Ulbrich3

  • 1Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, MO, USA; Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, IN, USA.

Neuroimage
|May 28, 2023
PubMed
Summary
This summary is machine-generated.

High-density diffuse optical tomography (HD-DOT) successfully maps brain activity during spoken language production, overcoming limitations of fMRI and PET scans. This neuroimaging technique is suitable for naturalistic settings and brain-computer interfaces.

Keywords:
ArticulationCovertHigh-density diffuse optical tomographyNaturalistic languageOvertSpeech

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Area of Science:

  • Neuroimaging
  • Cognitive Neuroscience
  • Language Processing

Background:

  • Established neuroimaging methods like fMRI, PET, and ECoG offer insights into language processing but are limited in naturalistic settings, especially for spoken language production.
  • High-density diffuse optical tomography (HD-DOT) presents a promising alternative, offering high-fidelity brain function mapping in an open, silent environment suitable for real-life scenarios.
  • Previous studies validated HD-DOT against fMRI for language comprehension and silent production, but its efficacy for overt (spoken) language production remained unestablished.

Purpose of the Study:

  • To assess the capability of HD-DOT in mapping cortical responses associated with overt language production.
  • To evaluate HD-DOT's resilience to movement artifacts during speech.
  • To investigate brain region recruitment across a hierarchy of language tasks, including silent reading and covert/overt verb production.

Main Methods:

  • Utilized high-density diffuse optical tomography (HD-DOT) to map brain activity in 33 healthy, right-handed native English speakers.
  • Participants engaged in a sequence of language tasks: silent word reading, covert verb production, and overt verb production.
  • Employed stringent cluster-extent based thresholding to identify statistically significant brain activations and deactivations.

Main Results:

  • HD-DOT demonstrated resilience to movement artifacts introduced by overt speaking.
  • The study observed significant sensitivity of HD-DOT in detecting key brain activations and deactivations related to language perception and naturalistic production.
  • Statistically significant neural recruitment was identified in occipital, temporal, motor, and prefrontal cortices across all three language tasks.

Conclusions:

  • HD-DOT is a viable neuroimaging technique for mapping brain activity during overt language production, even in the presence of speech-related movements.
  • Findings support the use of HD-DOT for studying naturalistic language comprehension and production in real-world social interactions.
  • This research establishes a foundation for employing HD-DOT in applications such as presurgical language mapping and brain-machine interfaces.