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Figure 2 | Journal of NeuroEngineering and Rehabilitation

Figure 2

From: Augmented visual feedback counteracts the effects of surface muscular functional electrical stimulation on physiological tremor

Figure 2

Tremor recordings and inherent power spectra. A: Example of recordings in subject 2, obtained with triaxial accelerometry. Signals (duration of epochs: 15 sec) recorded at the level of the index finger during task H in the 4 conditions (NSNL: no stimulation, laser off; NSL: no stimulation, laser on; STINL: stimulation off, laser off; STIL: stimulation on, laser on). Axis x, y and z (cartesian coordinates) and composite data are shown for each condition. A strong reduction of tremor oscillations is observed in HSTINL as compared to HNSNL and HNSL. The reduction is antagonized by augmented visual input (HSTIL). B: power spectra (related to tridimensional composite data; expressed in arbitrary units: a.u.) obtained by FFT analysis of tremor recorded at the finger during tasks H (Top panel) and A (Bottom panel) in the 4 conditions. Note the reduction of power spectra in the condition STINL (green lines).

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