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Related Experiment Videos

rTMS over the intraparietal sulcus disrupts numerosity processing.

Marinella Cappelletti1, Hilary Barth, Felipe Fregni

  • 1Center for Non-Invasive Brain Stimulation, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA. m.cappelletti@ucl.ac.uk

Experimental Brain Research
|January 12, 2007
PubMed
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Investigating the intraparietal sulcus (IPS) role in number processing, this study found the left IPS is crucial for both symbolic and non-symbolic numerical tasks. The right IPS showed an opposite effect, enhancing performance.

Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Psychology

Background:

  • The intraparietal sulcus (IPS) is hypothesized to be involved in numerical magnitude representation.
  • The precise causal role of the IPS in processing both symbolic and non-symbolic numerical information remains unclear.

Purpose of the Study:

  • To investigate the causal role of the left and right IPS in the representation of symbolic (Arabic numbers) and non-symbolic (dot arrays) numerosities.
  • To determine if numerical processing relies on distinct neural mechanisms compared to analogue stimulus properties.

Main Methods:

  • Repetitive Transcranial Magnetic Stimulation (rTMS) was used to temporarily deactivate the left and right IPS.
  • Participants performed tasks comparing symbolic and non-symbolic numerosities.

Related Experiment Videos

  • A control task assessed performance on analogue stimulus properties (ellipse orientation).

    • Main Results:

    • rTMS to the left IPS impaired comparisons of both symbolic and non-symbolic numerosities.
    • rTMS to the right IPS enhanced performance on these numerical tasks.
    • Numerical distance effects were observed, with greater impairment/lesser facilitation for similar magnitudes.
    • No significant effects were found when stimulating the angular gyrus.

    Conclusions:

    • The left IPS is critical for processing both symbolic and non-symbolic numerosity.
    • Numerical magnitude representation may depend on common neural mechanisms within the left IPS.
    • These mechanisms appear distinct from those processing analogue stimulus properties.