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Fig. 2 | Journal of NeuroEngineering and Rehabilitation

Fig. 2

From: Decoding the grasping intention from electromyography during reaching motions

Fig. 2

Representative examples of the EMG activity and the phases of the motion of the able-body subject 4 (left) and the amputee subject TR4 (right). The graphs in the middle correspond to the linear envelope of the EMG signals of the upper-arm (red lines) and the forearm (blue lines). The grey shadow areas correspond to the standard deviations of the timings where the shifts between the phases occurred. The graphs on the bottom of the figure show a representation with Gaussian Mixture Models (GMMs) of the EMG activity of the three phases projected on the first two components of third phase after performed Principal Component Analysis (PCA). The analysis was performed on the complete muscle set (N=12) and when using only the muscles of the forearm (N=5). The GMR representation shows limited overlap between the three phases, indicating differences on the EMG activity of the phases. Occasionally, an extended overlap occurred between the first and second phases as presented in the bottom-right graph. However, the third phase had rarely overlapped with any of the other two phases. Please see the Additional file 1 for more information regarding the EMG activity and its GMM representation for all the participants

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