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Low-frequency rTMS in the superior parietal cortex affects the working memory in horizontal axis during the spatial

Jéssica Alves Ribeiro1, Francisco Victor Costa Marinho2,3, Kaline Rocha1,4

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Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology
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PubMed
Summary

Low-frequency repetitive transcranial magnetic stimulation (rTMS) applied to the superior parietal cortex may alter spatial working memory (SWM). This non-invasive brain stimulation impacts the interpretation of horizontal and vertical spatial coordinates.

Keywords:
Spatial planeSpatial working memoryTranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Spatial working memory (SWM) is crucial for cognitive functions.
  • Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive brain stimulation technique.
  • Previous research suggests low-frequency rTMS may impact SWM, particularly when applied to the parietal cortex.

Purpose of the Study:

  • To investigate the effect of low-frequency rTMS on the superior parietal cortex (SPC) in SWM.
  • To determine if rTMS influences the interpretation of vertical and horizontal axes in an SWM task.
  • To enhance understanding of rTMS's impact on SWM performance.

Main Methods:

  • A crossover study design involving 20 healthy participants.
  • Two conditions: a control condition and a 1-Hz rTMS condition applied over the SPC (Pz electrode).
  • Participants performed a spatial working memory task involving two random coordinates.

Main Results:

  • Low-frequency rTMS over the SPC significantly influenced SWM performance (p < 0.05).
  • A larger distance of the axes interception point was observed, indicating altered spatial processing.
  • The effect of rTMS on SWM was more pronounced for the horizontal axis.

Conclusions:

  • Low-frequency rTMS applied to the superior parietal cortex modulates spatial working memory.
  • This stimulation technique affects the processing of spatial coordinates, with a notable impact on horizontal axis interpretation.