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Neuroanatomical Basis of Individuality in Muscle Tuning Function: Neural Correlates of Muscle Tuning
- Source :
- Frontiers in Behavioral Neuroscience, Vol 13 (2019), Frontiers in Behavioral Neuroscience
- Publication Year :
- 2019
- Publisher :
- Frontiers Media SA, 2019.
-
Abstract
- In a conventional view of motor control, the human brain might employ an optimization principle that leads a stereotypical motor behavior which we observe as an averaged behavioral data over subjects. In this scenario, the inter-individual motor variability is considered as an observation noise. Here, we challenged this view. We considered a motor control task where the human participants manipulated arm force by coordinating shoulder and elbow torques and investigated the muscle-tuning function that represents how the brain distributed the ideal joint torques to multiple muscles. In the experimental data, we observed large inter-individual variability in the profile of a muscle-tuning function. This contradicts with a well-established optimization theory that is based on minimization of muscle energy consumption and minimization of motor variability. We then hypothesized the inter-subject differences in the structure of the motor cortical areas might be the source of the across-subjects variability of the motor behavior. This was supported by a voxel-based morphometry analysis of magnetic resonance imaging; The inter-individual variability of the muscle tuning profile was correlated with that of the gray matter volume in the premotor cortex which is ipsilateral to the used arm (i.e., right hemisphere for the right arm). This study suggests that motor individuality may originate from inter-individual variation in the cortical structure.
- Subjects :
- Computer science
Cognitive Neuroscience
Muscle Energy
computer.software_genre
muscle tuning function
lcsh:RC321-571
Premotor cortex
03 medical and health sciences
Behavioral Neuroscience
0302 clinical medicine
Voxel
medicine
motor control
gray matter volume
VBM
lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry
Original Research
030304 developmental biology
0303 health sciences
Neural correlates of consciousness
medicine.diagnostic_test
brain structure
Motor control
Magnetic resonance imaging
Human brain
medicine.anatomical_structure
Behavioral data
Neuropsychology and Physiological Psychology
computer
Neuroscience
030217 neurology & neurosurgery
Subjects
Details
- Language :
- English
- ISSN :
- 16625153
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- Frontiers in Behavioral Neuroscience
- Accession number :
- edsair.doi.dedup.....c94d41a49c17841df534178e38285eec
- Full Text :
- https://doi.org/10.3389/fnbeh.2019.00028