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Different hemispheric specializations for pitch and audioverbal working memory.

Joon-Hyuk Imm1, Eunjoo Kang, Tak Youn

  • 1Department of Diagnostic Radiology, Nuclear Medicine and Research Institute of Radiological Science, Yonsei University College of Medicine, Seoul, Korea.

Neuroreport
|February 19, 2008
PubMed
Summary

Single-pulse transcranial magnetic stimulation (TMS) revealed distinct brain region involvement for pitch and audioverbal working memory. Right hemisphere regions were critical for pitch, while the left inferior parietal region was key for audioverbal tasks.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Brain Function

Background:

  • Working memory is crucial for cognitive tasks.
  • Understanding the neural basis of working memory, particularly hemispheric specialization, is an ongoing research area.
  • Transcranial magnetic stimulation (TMS) offers a method to probe the causal role of specific brain regions in cognitive functions.

Purpose of the Study:

  • To investigate the critical timing and regional involvement of brain areas in pitch and audioverbal working memory.
  • To determine if different brain hemispheres are specialized for processing pitch versus audioverbal information within working memory.

Main Methods:

  • Employed single-pulse transcranial magnetic stimulation (TMS) on 12 healthy participants.
  • Administered TMS over dorsolateral prefrontal and inferior parietal regions in both hemispheres.
  • Tested participants using pitch and audioverbal N-back tasks at four time points (250, 450, 650, 850 ms) post-stimulus onset.

Main Results:

  • For the pitch N-back task, TMS over right hemisphere regions significantly increased reaction time, indicating interference with working memory.
  • For the audioverbal N-back task, TMS over the left inferior parietal region at 450 ms post-stimulus onset significantly increased reaction time.
  • These findings suggest differential involvement of brain regions and timing for distinct working memory types.

Conclusions:

  • The study provides evidence for hemispheric specialization in working memory.
  • Pitch working memory appears to rely more on right hemisphere regions.
  • Audioverbal working memory shows a specific reliance on the left inferior parietal region at a critical time window.