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Impairing somatosensory working memory using rTMS.

Ryszard Auksztulewicz¹, Bernhard Spitzer, Dominique Goltz

¹Berlin School of Mind and Brain, Luisenstr. 56, Haus 1, 10099 Berlin, Germany. ryszard.auksztulewicz@gmail.com

The European Journal of Neuroscience

|August 26, 2011

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Investigating somatosensory working memory, this study used repetitive transcranial magnetic stimulation (rTMS) to show the inferior frontal gyrus (IFG) is causally involved in maintaining tactile information.

Area of Science:

Neuroscience
Cognitive Psychology
Human Brain Function

Background:

Somatosensory working memory is crucial for processing tactile information.
Previous research linked the inferior frontal gyrus (IFG) to somatosensory working memory, but causality was unclear.
Correlational studies dominated, leaving the IFG's exact role in information maintenance undetermined.

Purpose of the Study:

To determine if the inferior frontal gyrus (IFG) is causally involved in maintaining somatosensory information during working memory tasks.
To investigate the causal role of IFG neural activity in successful somatosensory information maintenance.

Main Methods:

Utilized online repetitive transcranial magnetic stimulation (rTMS) to transiently disrupt neural activity in the IFG.

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Participants performed a somatosensory working memory task involving tactile information maintenance.

A physically matched perceptual control task was used to isolate working memory effects.

Main Results:

Repetitive transcranial magnetic stimulation (rTMS) significantly impaired performance on the working memory task.
No significant impairment was observed in the perceptual control task, indicating a specific effect on working memory.
Disruption of the IFG in either hemisphere resulted in comparable working memory deficits.

Conclusions:

Neural activity in the inferior frontal gyrus (IFG) plays a causal role in the successful maintenance of somatosensory information.
These findings establish a causal link between IFG function and somatosensory working memory.
The IFG is essential for holding tactile information in mind for later recall.