Figure 1
From: Self-modulation of rectus femoris reflex excitability in humans
Experimental setup and visual feedback of RF (rectus femoris) operant H-reflex conditioning. (a) Participant with electrodes on the right leg is in the upright standing posture, facing visual feedback from a computer monitor. (b) During control/baseline trials, only the background EMG level of the RF was provided on the left bar graph. If the background EMG level of the RF and its antagonist pair MH (medial hamstrings) was within the shaded region, the bar remained green and the electrical stimulation was delivered. Otherwise, the bar turned red with no stimulation or trial progression. (c) During the training trial, RF H-reflex size and cumulative success rate were provided along with background EMG. The bar turned green if the RF H-reflex was below the threshold and turned red if larger than the threshold.
