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Hemispheric preference in visuospatial processing: a complementary approach with fMRI and lesion studies.

V W Ng1, P J Eslinger, S C Williams

  • 1Neuroimaging Research Group, Institute of Psychiatry, London, UK. v.ng@iop.kcl.ac.uk

Human Brain Mapping
|June 23, 2000
PubMed
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Both brain hemispheres contribute to spatial cognition, challenging traditional views. Functional MRI and lesion studies reveal bilateral parietal lobe activation, with the right hemisphere playing a key role in initiating spatial tasks.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Traditional models posit distinct hemispheric specializations for language (left) and spatial processing (right).
  • Emerging evidence suggests a more integrated role for both cerebral hemispheres in cognitive functions.
  • Clarifying hemispheric dominance in spatial cognition requires complementary neuroimaging and lesion studies.

Purpose of the Study:

  • To investigate hemispheric involvement in spatial processing using functional Magnetic Resonance Imaging (fMRI) and human brain lesion data.
  • To determine if these combined techniques can resolve ambiguities regarding hemispheric dominance in spatial tasks.
  • To examine the role of the parietal lobes in a well-established spatial cognition task.

Main Methods:

Related Experiment Videos

  • Utilized functional Magnetic Resonance Imaging (fMRI) to observe brain activity in ten healthy adult volunteers performing a modified Benton Judgement of Line Orientation (JLO) test.
  • Analyzed lesion data from 17 patients with parietal lobe damage to assess the impact on JLO task performance.
  • Employed wavelet analysis on fMRI time-series data to investigate temporal dynamics of hemispheric activation.

    • Main Results:

    • Significant bilateral superior parietal lobe activation was observed during the spatial task (p < 0.0005) via fMRI.
    • Patients with either right or left parietal lobe damage exhibited significant impairments in the JLO task, with right parietal damage causing more severe deficits.
    • Wavelet analysis indicated a more dominant role for the right parietal lobe in initiating the spatial task.

    Conclusions:

    • Spatial cognition involves bilateral engagement of the parietal lobes, challenging strict hemispheric specialization models.
    • Both fMRI and lesion studies provide converging evidence for the complementary roles of the hemispheres in spatial processing.
    • The right parietal lobe appears to play a critical, initiating role in spatial tasks, even within a bilaterally represented function.