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Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
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Reach-To-Grasp Movements: A Multimodal Techniques Study.

Sonia Betti1, Giovanni Zani1, Silvia Guerra1

  • 1Dipartimento di Psicologia Generale, Università di Padova, Padua, Italy.

Frontiers in Psychology
|July 3, 2018
PubMed
Summary
This summary is machine-generated.

The index finger

Keywords:
EMGMEPkinematicsreach-to-grasptranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Motor Control
  • Biomechanics

Background:

  • Understanding the neural basis of grasping is crucial for rehabilitation and robotics.
  • Differentiating between precision grasps and whole-hand grasps (WHGs) involves complex sensorimotor integration.
  • Previous research has explored kinematics and muscle activity separately, but simultaneous investigation is less common.

Purpose of the Study:

  • To investigate the correlation between corticospinal activity, kinematics, and electromyography (EMG) during precision and whole-hand grasps.
  • To identify neural and kinematic markers that distinguish between different grasp types during preparation and execution.
  • To explore the role of specific muscles, like the index finger (FDI), in differentiating grasp intentions.

Main Methods:

  • Simultaneous recording of motor-evoked potentials (MEPs) via transcranial magnetic stimulation (TMS), EMG, and 3-D motion capture.
  • Participants performed precision and whole-hand grasps towards objects of different sizes.
  • Analysis focused on differences in neural activity, muscle activation patterns, and movement kinematics.

Main Results:

  • Distinct muscle activation patterns were observed for FDI and abductor digiti minimi (ADM) during grasp execution.
  • Only FDI activity differentiated between grasp types during the motor preparation phase.
  • Precision grips and WHGs differed in finger spread during shaping, timing, and velocity; correlations linked FDI extension to WHG temporal aspects.

Conclusions:

  • The index finger (FDI) acts as an early marker for differential motor preparation and a navigator in whole-hand grasps.
  • Simultaneous neuro-behavioral analysis reveals insights into the organization of reach-to-grasp movements.
  • Findings suggest crosstalk between different neural levels involved in planning and executing grasps.