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Related Experiment Videos

Quantifying variability in the planum temporale: a probability map.

C F Westbury1, R J Zatorre, A C Evans

  • 1Department of Neuropsychology and Cognitive Neuroscience, Montreal Neurological Institute and Hospital, Quebec, Canada. chrisw@ualberta.ca

Cerebral Cortex (New York, N.Y. : 1991)
|July 30, 1999
PubMed
Summary
This summary is machine-generated.

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This study found no significant brain differences in the planum temporale (PT) between hemispheres. Methodological variations in defining the PT

Area of Science:

  • Neuroimaging
  • Neuroanatomy
  • Brain Asymmetry

Background:

  • Hemispheric asymmetries in brain regions are crucial for understanding functional specialization.
  • The planum temporale (PT) is a brain region implicated in language and auditory processing.
  • Previous studies on PT asymmetry have faced challenges in consistent identification and measurement.

Purpose of the Study:

  • To propose and validate an operational definition for identifying the posterior border of the PT on MRI scans.
  • To accurately measure grey matter volume and cortical surface area of the PT.
  • To investigate potential hemispheric differences in PT size.

Main Methods:

  • Utilized an interactive voxel-painting program for simultaneous PT labeling across multiple MRI scan planes.

Related Experiment Videos

  • Transformed MRI data into standardized Talairach-Tournoux stereo-taxic space for 50 healthy, right-handed volunteers.
  • Measured grey matter volume and cortical surface area, controlling for individual brain size and shape variations.

    • Main Results:

    • The planum temporale (PT) region exhibited high inter-individual variability, with no single voxel consistently identified.
    • No significant hemispheric differences in PT volume or cortical surface area were found using the proposed method.
    • An alternative 'knife-cut' method for defining the posterior border introduced artificial asymmetry.

    Conclusions:

    • The developed operational definition and measurement techniques provide a reliable method for PT analysis.
    • The study did not find evidence for systematic hemispheric asymmetry in the PT in the studied population.
    • Findings highlight the impact of methodological choices on neuroimaging results and emphasize the need for standardized approaches.