Journal: Journal of Neural Engineering
Article Title: Frequency dependence of cortical somatosensory evoked response to peripheral nerve stimulation with controlled afferent excitation
doi: 10.1088/1741-2552/adc204
Figure Lengend Snippet: Experimental Setup: the participant stood in a comfortable standing posture, at arm’s length from a wall-mounted monitor. Tibial nerve was stimulated at the popliteal fossa with constant current stimulator DS8R (Digitimer Ltd.). Soleus electromyography (EMG) was recorded with an AMT-8 (Bortec Biomedical Ltd) analog amplifier and a digitizer NI-6212 (National Instruments) using our Evoked Potential Operant Conditioning System (EPOCS [ , ]). Electroencephalography (EEG) was recorded with DSI-24 (Wearable Sensing) and BCI2000 software [ , ]. Wireless inertial measurement unit (IMU) sensors (Movella) were used to capture foot movement in three participants. To synchronize the datasets, TTL pulses were transmitted from the EPOCS and IMU hub to the EEG headset. Background EMG was displayed as the height of a vertical bar on the wall monitor, to help the participant maintain EMG within a predefined low range. The M-wave and H reflex was displayed on the screen as a time signal after every stimulation and their recruitment curves were monitored in pseudo-real time. The inset on the right shows the H-reflex and M-wave recruitment curves and the somatosensory evoked potential P40 and N70 response at the Cz electrode, from one of the participants.
Article Snippet: EMG was recorded with bipolar self-adhesive Ag/AgCl surface electrodes (Neuroplus electrodes (22 × 22 mm) (A10040-60, Vermont Medical Inc.) on the soleus muscle of the right leg to record the H-reflex and M-wave, and on its antagonist muscle tibialis anterior to record its ongoing (background) activity.
Techniques: Software