Reinterpreting our brain's body maps

Date:
January 21, 2022
Source:
Tohoku University
Summary:
Our brain maps out our body to facilitate accurate motor
control. For a century, the body map has been thought to have
applied to all types of motor actions. Now, a research group has
revealed that the body relies on multiple maps based on the choice
of motor system.



FULL STORY ==========================================================================
Our brain maps out our body to facilitate accurate motor control;
disorders of this body map result in motor deficits. For a century,
the body map has been thought to have applied to all types of motor
actions. Yet scientists have begun to query how the body map operates
when executing different motor actions, such as moving your eyes and
hands together.


==========================================================================
A recent research paper by Professor Kazumichi Matsumiya from Tohoku University's Graduate School of Information Sciences has revealed that
the body relies on multiple maps based on the choice of motor system.

Details of his research were published in the journal Proceedings of
the National Academy of Sciences on January 19, 2022.

Patients with motor dysfunction have abnormalities in their hands and
feet that are felt in the brain. Traditional rehabilitation takes in
to account the physical dysfunctions. But recovery of the neurological
aspects is not visible and subjective.

To reveal more behind our body map, Matsumiya organized an experiment
where participants were instructed to point to various parts of their
right hand with the index finger on their left hand whilst simultaneously following with their eyes. This enabled him to measure the mind's
perception of the right hand for the eyes and the left hand movements.

Even though the eye and the left hand were pointing to the same spots,
the imaging from the pointing was more distorted, demonstrating the
existence of a separate body map.

Matsumiya expects his findings to contribute to the development
of new diagnostic techniques for motor dysfunction. "Today,
Japan's population is aging rapidly, so we are experiencing a sharp
increase in the number of patients with motor dysfunctions. Better understanding of how patients' bodies are perceived by their minds
will help to build a more effective rehabilitation technique."
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========================================================================== Journal Reference:
1. Kazumichi Matsumiya. Multiple representations of the body schema
for the
same body part. Proceedings of the National Academy of Sciences,
2022; 119 (4): e2112318119 DOI: 10.1073/pnas.2112318119 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/01/220121124858.htm

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