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Nonverbal sound processing in semantic dementia: a functional MRI study.

Johanna C Goll1, Gerard R Ridgway, Sebastian J Crutch

  • 1Dementia Research Centre, UCL Institute of Neurology, University College London, London, UK.

Neuroimage
|March 13, 2012
PubMed
Summary

Semantic dementia (SD) impairs object meaning. This study reveals SD affects sound processing, from perception to category formation, implicating antero-lateral temporal cortex in semantic representation.

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Area of Science:

  • Neuroscience
  • Cognitive Neurology
  • Neuroimaging

Background:

  • Semantic dementia (SD) is a neurodegenerative syndrome characterized by a selective loss of object and concept meaning.
  • Understanding the underlying brain mechanisms is crucial for insights into the semantic system and neurodegenerative disease vulnerability.

Purpose of the Study:

  • To investigate the brain correlates of sensory object processing in patients with SD using nonverbal sounds.
  • To compare brain activation patterns in SD patients with healthy controls.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • Nine patients with SD and healthy control subjects participated.
  • The paradigm involved processing of spectrotemporally complex meaningless sounds and environmental sound categories (animal vs. tool sounds).

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Main Results:

  • Patients with SD exhibited differential cortical activation surrounding the superior temporal sulcus compared to controls.
  • This differential activation was observed during both perceptual processing of complex sounds and semantic processing of sound categories.
  • Defective sound object processing in SD spans pre-semantic perception and semantic category formation.

Conclusions:

  • Antero-lateral temporal cortical mechanisms are critical for representing and differentiating sound categories.
  • The findings suggest a network-level functional signature for SD involving defective sound object processing.
  • This study provides a disease model for understanding the semantic system's organization and vulnerability.