Human motor control Nonlinear cortical responses in EEG evoked by - - PowerPoint PPT Presentation

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Nonlinear cortical responses in EEG evoked by continuous wrist manipulations

Alfred C. Schouten Associate professor, Neuromechanics & Motor Control Delft University of Technology / University of Twente

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Human motor control

http://www.bradbyers.com | http://www.dailypicayune.com | http://www.freestock.com/images

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Contents

• SYS ID of human motor control
• Cortical responses to sensory stimuli
• Nonlinear neural connectivity

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The Central Nervous System

• Closed loop system
• Many feedback loops

– Movement control – Thermoregulation – Pain modulation – Cardiovascular system – etc.

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Human Motor Control

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Approach

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System identification

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16-Apr-2013 time=[-0.1 -0.0801] avg=[-1 1] 16-Apr-2013 time=[0.0151 0.0352] avg=[-1 1]

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Afferent pathway from sensor to brain

41 ms

Perturbation → brain

Yuan, Schouten et al. Int J Neural Syst 2016

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Perturbation to EMG

• Nonlinear interaction:

Perturbation → EMG > Perturbation → EEG

• Time delay (mean ± std.):

Perturbation → EMG 33 ± 6 ms < Perturbation → EEG 43 ± 8 ms 32 ms

Yuan, Schouten et al. Int J Neural Syst 2016

58

Brief discussion

• Perturbation to EEG
• Perturbation to EMG

Dominant role of the spinal loop in the nonlinear muscle activity in response to mechanical perturbation.

59

Brief discussions

• sensory signal arrives at

the primary somatosensory cortex,

• the transcortical reflex

loop only weakly contributes to the nonlinear connectivity in the stretch reflex.

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