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Modulating Cognition Using Transcranial Direct Current Stimulation of the Cerebellum
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Effects of cortical polarization on mental arithmetic

P Pauli1, H Schleichert, L E Bourne

  • 1University of Tübingen, Institute of Medical Psychology and Behavioral Neurobiology, Tübingen, Germany paul.pauli@uni-tuebingen.de

Brain Research. Cognitive Brain Research
|August 26, 1998
PubMed
Summary

Biofeedback training influenced brain activity, showing cortical positivity speeds up mental math but increases errors. Cortical negativity may enhance accuracy by promoting inhibition.

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Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Human Learning and Memory

Background:

  • Understanding the neural mechanisms underlying cognitive processes like mental arithmetic is crucial.
  • Slow cortical potentials (SCPs) are slow voltage changes in the brain's electrical activity, reflecting cortical excitability.
  • Biofeedback offers a method to voluntarily control physiological states, including brain activity.

Purpose of the Study:

  • To investigate the causal relationship between pre-stimulus cortical polarity and mental calculation performance.
  • To determine if biofeedback-induced changes in cortical polarity affect response initiation and error rates in arithmetic tasks.

Main Methods:

  • Participants underwent biofeedback training to modulate their slow cortical potential (SCP) polarity (positive or negative) before solving multiplication problems.
  • A limited set of practiced single-digit multiplication problems was used to ensure reliance on direct memory retrieval.
  • Response initiation time (mental calculation) and response execution time (motor speed) were measured, along with accuracy.

Main Results:

  • Cortical positivity before problem presentation was linked to faster response initiation times for correct answers.
  • Cortical positivity also correlated with a higher number of multiplication errors compared to cortical negativity.
  • Motor response execution time remained unaffected by the induced cortical polarity.

Conclusions:

  • Pre-task cortical positivity appears to facilitate direct retrieval of arithmetic facts, possibly by reducing inhibition of incorrect responses.
  • This reduced inhibition, induced by positivity, leads to faster but less accurate performance.
  • Cortical negativity may promote greater accuracy through enhanced inhibition, though potentially at the cost of speed.