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Related Experiment Videos

Visual and motor cortex excitability: a transcranial magnetic stimulation study.

Babak Boroojerdi1, Ingo G Meister, Henrik Foltys

  • 1Neurologische Klinik, Universitätsklinikum, Pauwelsstrasse 30, 52074, Aachen, Germany. babak.boroojerdi@post.rwth-aachen.de

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|August 10, 2002
PubMed
Summary

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Phosphene thresholds (PTs) are stable measures of visual cortex excitability and are higher than motor thresholds (MTs). PTs and MTs are not correlated, indicating MTs do not reflect non-motor cortical excitability.

Area of Science:

  • Neuroscience
  • Neurophysiology
  • Cognitive Science

Background:

  • Transcranial magnetic stimulation (TMS) measures cortical excitability.
  • Phosphene thresholds (PTs) assess visual cortex excitability.
  • Motor thresholds (MTs) assess motor cortex excitability and are used for non-motor areas.

Purpose of the Study:

  • Compare PTs and MTs.
  • Assess the stability of PTs and MTs across sessions.
  • Investigate the relationship between PTs and MTs.

Main Methods:

  • Focal TMS was used to determine PTs over the occipital cortex.
  • Focal TMS was used to determine MTs over the motor cortex.

Main Results:

Related Experiment Videos

  • PTs were significantly higher than MTs.
  • Both PTs and MTs demonstrated stability across sessions.
  • No significant correlation was found between PTs and MTs.

    • Conclusions:

    • Phosphene threshold is a reliable and stable measure of visual cortex excitability.
    • Motor thresholds do not appear to reflect the excitability of non-motor cortical areas.