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Transcranial direct current stimulation accelerates allocentric target detection.

Jared Medina1, Jacques Beauvais, Abhishek Datta

  • 1Department of Neurology, Center for Cognitive Neuroscience, University of Pennsylvania, 3 West Gates, 3400 Spruce Street, Philadelphia, PA 19104, USA. jared.medina@uphs.upenn.edu

Brain Stimulation
|July 13, 2012
PubMed
Summary
This summary is machine-generated.

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Right anodal/left cathodal transcranial direct current stimulation (tDCS) enhanced allocentric visuospatial processing in healthy individuals. This finding suggests tDCS may help treat allocentric neglect.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuromodulation

Background:

  • Hemispatial neglect research indicates separate egocentric and allocentric processing mechanisms.
  • Previous studies explored transcranial direct current stimulation (tDCS) effects on attention in healthy individuals, but not specifically on allocentric/egocentric processing.

Purpose of the Study:

  • To investigate if tDCS, a noninvasive brain stimulation method, influences visuospatial processing within allocentric and egocentric frames of reference.
  • To determine the effects of specific tDCS polarities (anodal/cathodal) on posterior parietal cortex activity related to spatial processing.

Main Methods:

  • Healthy participants performed a target detection task assessing egocentric (target relative to viewer) and allocentric (target gap location) visuospatial processing.

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Transcranial Direct Current Stimulation and Simultaneous Functional Magnetic Resonance Imaging

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  • Transcranial direct current stimulation (tDCS) was applied to the posterior parietal cortex in three conditions: right anodal/left cathodal, right cathodal/left anodal, and sham.
  • Performance was evaluated before, during, and after tDCS application.

    • Main Results:

    • A significant allocentric hemispatial effect was observed during and after tDCS.
    • Right anodal/left cathodal tDCS led to faster reaction times for detecting stimuli with left-sided gaps compared to right-sided gaps.

    Conclusions:

    • The findings suggest that right anodal/left cathodal tDCS facilitates allocentric visuospatial processing.
    • This stimulation protocol may hold therapeutic potential for individuals with allocentric neglect.