Cortical plasticity after hand prostheses use: Is the hypothesis of deafferented cortex “invasion” always true?
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Date
2020-10
Publication Type
Journal Article
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yes
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Abstract
Objective
To study motor cortex plasticity after a period of training with a new prototype of bidirectional hand prosthesis in three left trans-radial amputees, correlating these changes with the modification of Phantom Limb Pain (PLP) in the same period.
Methods
Each subject underwent a brain motor mapping with Transcranial Magnetic Stimulation (TMS) and PLP evaluation with questionnaires during a six-month training with a prototype of bidirectional hand prosthesis.
Results
The baseline motor maps showed in all three amputees a smaller area of muscles representation of the amputated side compared to the intact limb. After training, there was a partial reversal of the baseline asymmetry. The two subjects affected by PLP experienced a statistically significant reduction of pain.
Conclusions
Two apparently opposite findings, the invasion of the “deafferented” cortex by neighbouring areas and the “persistence” of neural structures after amputation, could vary according to different target used for measurement. Our results do not support a correlation between PLP and motor cortical changes.
Significance
The selection of the target and of the task is essential for studies investigating motor brain plasticity. This study boosts against a direct and unique role of motor cortical changes on PLP genesis. © 2020 Published by Elsevier B.V.
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published
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Journal / series
Volume
131 (10)
Pages / Article No.
2341 - 2348
Publisher
Elsevier
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Edition / version
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Software
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Date collected
Date created
Subject
Hand amputation; Motor map; Bidirectional hand prosthesis; Robotic hand; Brain plasticity; Phantom limb pain
Organisational unit
09632 - Raspopovic, Stanisa (ehemalig) / Raspopovic, Stanisa (former)