Surface electromyography-based biofeedback and knee rehabilitation: A review of the literature

The number of total knee arthroplasties (TKA) performed yearly is rapidly increasing. Additionally, upwards of 50% of patients who receive TKA never achieve a full functional recovery. This suggests considerable room for improvement. This need for improvement expands beyond TKA as similar effects are noted across knee injuries. Electromyography-based biofeedback (EMGBF) involves the delivery of feedback based on the activity of targeted muscle. By providing feedback contingent on changes in muscle amplitude, EMGBF may be an effective tool for strengthening quadricep muscles. This review aims to evaluate the utility of sEMGBF during physical therapy for various knee injuries. All studies were evaluated for the effectiveness of sEMGBF at improving muscle strength, range of motion, and reducing pain. Most studies reviewed found that including sEMGBF in physical therapy produced greater clinical benefits for patients than exercise alone. Further research is necessary to determine the best practice for including EMGBF in physical therapy.     

Reconciling current approaches to blindsight

After decades of research, blindsight is still a mysterious and controversial topic in consciousness research. Currently, many researchers tend to think of it as an ideal phenomenon to investigate neural correlates of consciousness, whereas others believe that blindsight is in fact a kind of degraded vision rather than “truly blind”. This article considers both perspectives and finds that both have difficulties understanding all existing evidence about blindsight. In order to reconcile the perspectives, we suggest two specific criteria for a good model of blindsight, able to encompass all evidence. We propose that the REF-CON model (Overgaard & Mogensen, 2014) may work as such a model.     

The neural substrate of schadenfreude: The effects of competition level changes on the processing of pain in others

Schadenfreude is defined as the joy individuals feel as a result of the pain felt by opposing group members. In order to experience schadenfreude, it is not enough for the individual who is suffering to be a member of the opposing group, but also the perceived competitiveness level of the opposing group must be high. Although this basic assumption of Schadenfreude's competitiveness is confirmed by self-report-based techniques, there is no study in the literature addressing the subject's neural bases. The aim of this study is to test the competitiveness assumptions of schadenfreude using the electroencephalography-based ERP method. For this purpose, EEG recordings were taken of 40 individuals who expressed themselves as belonging to a political party while watching the outgroup and ingroup party members in pain. Perception of competition levels of outgroup and ingroup members were manipulated during the study. The results show that pain empathy for the suffering individuals changes in relation to the competition level. Particularly related changes have been observed in late ERP components known to be related to consciousness. In this context, our study contributes to the literature as the first confirmation of the assumptions of schadenfreude competitiveness level by neuroscientific methodology.