8, 6 December 2013 | Experimental Brain Research, Vol. Image credit: Nanyang Technological University, Singapore. (2014), repeatability and solidity of extracted synergies of healthy people in interaction with devices for rehabilitation during reaching movements was demonstrated. No requirement on motor functionality was requested, even if patients were selected, with different levels of impairment. 4B, synergy A1; scalar product of 0.91), the rest could be only moderately well or poorly reconstructed (A2–A6; scalar product of 0.71–0.81). The activation coefficients for the second neural synergy demonstrated a positive, linear relationship with object mass (r = 0.86, p < 0.001; both G1 and G2; Fig. Thomas, C. K., Johansson, R. S., Westling, G., and Bigland-Ritchie, B. A recent state-of-the-art review on rehabilitation (Krebs and Volpe, 2015) concludes with the following sentence: “Ultimately the goal should be determining how best to customize the treatment protocol to meet each individual patient’s needs.” In order to maximize the gains inducted by rehabilitation, patients should undergo a customized treatment protocol tailored on specific criteria that would assure the highest probability of success, depending on their clinical status. 10, 9 January 2016 | Experimental Brain Research, Vol. Tresch, M. C., Cheung, V. C. K., and d’Avella, A. It might be claimed that the sample of patients in this study splits into two main groups: patients with shoulder prevalence and elbow prevalence. Figure 2E depicts the degree to which units at each of monkey G2's recording sites were activated, on average, during the time of peak activation of each neural synergy. Figure 8. U.S.A. 106, 19563–19568. Copyright: © 2017 Scano, Chiavenna, Malosio, Molinari Tosatti and Molteni. Front. Both the evidence and definition of these primitives remain tentative. Rep. 3, 243–247. Prevalence of elbow activity is instead a bad prognostic index, indicating the impossibility to perform the gesture. Exp. Thank you for your interest in spreading the word on PNAS. Copyright © 2020 National Academy of Sciences. A limitation of our technique is that proper identification of muscle synergies requires a high degree of complexity in the sampling of muscle coordination patterns. Is lower leg proprioception essential for triggering human automatic postural responses? Proc. Macpherson, J. M. (1991). We hypothesized that, if spatiotemporal muscle synergies are represented in motor cortex, motor neuronal firing patterns should decompose into the same number of dimensions as observed for EMG-derived synergies and with the same pattern of modulation over object conditions. Hum. %PDF-1.7 In mildly impaired patients recorded shortly after stroke, we observed that the muscle synergies of the stroke-affected arm were strikingly similar to those of the unaffected arm despite marked differences in motor performance between the arms. Sign In to Email Alerts with your Email Address, Representation of Muscle Synergies in the Primate Brain. 109, No. This “synergy tuning curve” may be considered as the neural command signal to the synergy, which activates a pattern of muscles appropriate to the postural response. 82, 225–260. Thirty-one stroke survivors were recruited from the San Camillo Hospital, Lido di Venezia, Italy (n = 21) and the Spaulding Rehabilitation Hospital, Boston (n = 10). Nevertheless, units controlling the recruitment of spatiotemporal synergies would also be expected to modulate their discharge according to kinematic variables such as object size. (2015). 4, 12 March 2013 | Experimental Brain Research, Vol. Further studies did not observe merging nor fractionation patterns in severe patients’ synergies during robot-assisted motion, as the total number of synergies reconstructed was the same of healthy control subjects, but with some altered muscle activation (Roh et al., 2013). (2005). Thus synergy composition is robust across subjects and reflects the consistency in the EMG tuning curves of the postural response (Macpherson 1988b). 6, 3 April 2015 | Journal of Neurophysiology, Vol. J. Neurophysiol. Consequently, a restricted number of synergies is the “basic set of vectors” that represent the invariant element that is shared by a group of motor programs. Furthermore, W1 was dominated by extensors of the hip, knee, and ankle and W2 by flexors, whereas W3 and W4 tended toward higher activations in biarticular thigh muscles. J. Neurophysiol. (1990). Subject-specific muscle synergies are indicated by a gray color. 4, Annual Review of Neuroscience, Vol. 234, No. In fact, the median scalar-product similarity value between the extracted and reconstructed (via the merging model) affected-arm synergies decreased with the subjects’ poststroke duration (in log scale) (r = −0.610, P = 2.7 × 10−4). For example, when applied to images of faces, a nonnegative extraction routine generates basis vectors representing noses, ears, and eyes, whereas PCA generates components that all tend to look roughly like an entire face (Lee and Seung 1999). Merging of healthy motor modules predicts reduced locomotor performance and muscle coordination complexity post-stroke. Consequently, cluster analysis suggests that patients tend to show individual patterns. In contrast, in subjects with severe motor impairment (FM score ≤30), regardless of when the patients were recorded relative to stroke onset, there was much less resemblance between the synergies of the two arms.

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