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Related Experiment Videos

Left posterior BA37 is involved in object recognition: a TMS study.

L Stewart1, B Meyer, U Frith

  • 1Institute of Cognitive Neuroscience, University College London, Alexander House, 17 Queen Square, WC1N 3AR, London, UK. l.stewart@ucl.ac.uk

Neuropsychologia
|December 15, 2000
PubMed
Summary

Repetitive transcranial magnetic stimulation (rTMS) over the left posterior BA37 selectively impaired picture naming, suggesting this brain region is crucial for object recognition. This finding supports the role of left BA37 in visual processing.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neurolinguistics

Background:

  • Previous functional imaging studies suggest the left posterior BA37 plays a role in various cognitive functions, including phonological retrieval, semantic processing, face recognition, and object recognition.
  • The specific contribution of this region to distinct processing types remains unclear.

Purpose of the Study:

  • To investigate whether repetitive transcranial magnetic stimulation (rTMS) applied to the posterior aspect of BA37 could induce deficits specific to phonological retrieval, semantic processing, face processing, or object recognition.
  • To determine the causal role of left BA37 in these cognitive functions.

Main Methods:

  • Four experimental conditions were employed: word reading, nonword reading, color naming, and picture naming.

Related Experiment Videos

  • rTMS was delivered over the posterior BA37 of both the left (lBA37) and right (rBA37) hemispheres, as well as over the vertex as a control site.
  • Behavioral performance (naming times) was measured for each condition and stimulation site.

    • Main Results:

    • Subjects exhibited significantly slower picture naming times when rTMS was applied over lBA37 compared to vertex or rBA37 stimulation.
    • rTMS over lBA37 did not produce significant effects on word reading, nonword reading, or color naming.
    • The observed deficit in picture naming is attributed to a disruption in object recognition processes.

    Conclusions:

    • The posterior part of the left BA37 is causally involved in object recognition.
    • These findings corroborate previous neuroimaging evidence and highlight a necessary role for lBA37 in the visual recognition of objects.