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Related Experiment Videos

Virtual lesions and the not-so-modular brain.

D Lloyd1

  • 1Department of Philosophy, Trinity College, Hartford, Connecticut 06106, USA. dan.lloyd@trincoll.edu

Journal of the International Neuropsychological Society : JINS
|August 10, 2000
PubMed
Summary
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Cognitive neuropsychology traditionally assumes brain modularity. However, this review of 36 studies reveals brain functions are distributed across multiple regions, with brain regions often being multifunctional.

Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Cognitive neuropsychology traditionally posits brain modularity, with distinct regions performing specific functions.
  • Lesions typically affect contiguous brain areas, supporting the modularity hypothesis.
  • Previous research often assumed a one-to-one mapping between brain regions and cognitive functions.

Purpose of the Study:

  • To challenge the traditional view of brain modularity.
  • To investigate the distributed nature of cognitive functions across the brain.
  • To propose an integrated framework linking neuropsychology and functional neuroimaging.

Main Methods:

  • Review of 36 published functional neuroimaging studies.
  • Utilizing a "virtual lesions" technique to assess regional brain contributions.

Related Experiment Videos

  • Analysis of positron emission tomography (PET) imaging data.

    • Main Results:

    • Evidence suggests cognitive functions are distributed across multiple brain regions.
    • Findings indicate that specific brain regions are frequently multifunctional.
    • The review contradicts the strict modularity principle in cognitive neuroscience.

    Conclusions:

    • The brain's functional organization is more distributed than previously assumed.
    • Multifunctionality of brain regions is a key aspect of cognitive processing.
    • A revised model is proposed to better integrate neuropsychological and neuroimaging findings.