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Movement-related parameters modulate cortical activity during imaginary isometric plantar-flexions
Omar Feix do Nascimento1, Kim Dremstrup Nielsen, Michael Voigt
1Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology (HST), Aalborg University (AAU), Fredrik Bajers Vej 7D-3, 9220 Aalborg, Denmark. omar@hst.aau.dk
Experimental Brain Research
|December 2, 2005
Summary
Imagining motor tasks activates the motor cortex, with movement parameters like force influencing brain activity. Early brain potentials during imagined movements resemble actual ones but show smaller amplitudes.
Area of Science:
- Neuroscience
- Motor Control
- Cognitive Neuroscience
Background:
- Motor cortex activation during imagined movements is well-documented.
- It remains unclear if specific movement parameters modulate this cortical activity during imagination.
- Previous research has not fully explored the encoding of movement-related parameters in imagined tasks.
Purpose of the Study:
- To investigate if rate of torque development (RTD) and torque amplitude modulate cortical potentials during imagined motor tasks.
- To determine if the brain encodes specific movement parameters during motor imagery.
- To compare movement-related potentials (MRPs) between imagined and actual motor tasks.
Main Methods:
- Fifteen subjects performed imagined isometric plantar-flexion tasks.
- Electroencephalography (EEG) and electromyography (EMG) were recorded simultaneously.
- Analysis focused on movement-related potentials (MRPs), including readiness potential (RP), motor potential (MP), and movement-monitoring potential (MMP).
Main Results:
- Both RTD and torque amplitude were found to modulate cortical activity during imagined tasks.
- Information on movement parameters for imagined plantar-flexion appears encoded in the supplementary motor area (SMA) and primary motor cortex (M1).
- Early MRPs during imagined movements were morphologically similar but significantly smaller in amplitude compared to actual movements.
Conclusions:
- Motor imagery involves the modulation of cortical activity by movement-related parameters.
- The SMA and M1 play a role in encoding movement parameters during motor imagery.
- Differences in MRP amplitude between imagined and actual movements may suggest an 'abortion' of motor programs during imagination.