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. Author manuscript; available in PMC: 2019 Apr 1.
Published in final edited form as: J Neurosci Methods. 2018 Jul 24;308:106–115. doi: 10.1016/j.jneumeth.2018.07.016

Figure 3. Finger movement recording.

Figure 3

Movements of the finger were recorded using an orthosis placed around the first two phalanges of participant’s right index (left panel). A movement sensor was mounted on the orthosis and a touch sensor was embedded in the surface onto which the finger tapped. The right panel shows the normalized amplitude of the two sensor signals, averaged across participants, conditions and taps. The point LFF corresponds to the initiation of the finger flexion. LFC corresponds to the time at which the fingertip touches the table. LFE corresponds to the initiation of finger extension. LFD corresponds to the time at which the finger returns to the default position. Note that the dynamics of finger flexion, measured by the time interval between LFF and LFC, was quite constant across participants and taps, whereas the dynamics of finger extension, measured by the time between LFE and LFD, was more variable. Those results are consistent with the fact that participants were requested to synchronize the tapping of the finger against the touch sensor.