 Abstract hyperreflexure is common after neurological injuries such as stroke, yet clinical interventions have had mixed success. Our previous research has shown that hyperreflexure of the rectus femoris, RF, during pre-swing is closely associated with reduced swing phase knee flexion in those with post-stroke stiff knee gate, SKG. Thus, reduction of RF hyperreflexure may improve walking function in those with post-stroke SKG. A non-pharmacological procedure for reducing hyperreflexure has emerged based on operant conditioning of H-reflex, an electrical analog of the spinal stretch reflex. It is currently unknown whether operant conditioning can be applied to the RF. This feasibility study trains seven participants, five neurologically intact, two post-stroke, to down-condition the RFH reflex using visual feedback. We found an overall decrease in average RFH reflex amplitude among all seven participants, 44% drop, P less than 0.001, paired T test, of which the post-stroke individuals contributed, 49% drop. We. This article was authored by Kayang Soong Kim, Tunk Akbas, Robert Lee, and others. We are article.tv, links in the description below.