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Effects of movement direction upon kinematic characteristics of vertical arm pointing movements in man

Journal Article


Abstract


  • Vertical arm pointing movements in two directions (upwards and downwards), imposing two different loads (unload and 0.5 kg) and speeds (normal and fast) have been studied in six subjects. Movements were recorded using an optoelectronic system. Data analysis concentrated upon finger-tip kinematics. Significant effects of movement direction were recorded upon velocity profiles. The acceleration time, computed relative to total movement time, was greater for downward movements than for upward movements. In contrast however, no effects of load or speed were observed. Movement time was not affected by movement direction or load, for both speeds tested. These results suggest different planning processes, for movements with and against gravity and indicate that gravitational force influences the processes controlling movement execution.

Publication Date


  • 1998

Citation


  • Papaxanthis, C., Pozzo, T., & Stapley, P. (1998). Effects of movement direction upon kinematic characteristics of vertical arm pointing movements in man. Neuroscience Letters, 253(2), 103-106. doi:10.1016/S0304-3940(98)00604-1

Scopus Eid


  • 2-s2.0-0032483423

Start Page


  • 103

End Page


  • 106

Volume


  • 253

Issue


  • 2

Abstract


  • Vertical arm pointing movements in two directions (upwards and downwards), imposing two different loads (unload and 0.5 kg) and speeds (normal and fast) have been studied in six subjects. Movements were recorded using an optoelectronic system. Data analysis concentrated upon finger-tip kinematics. Significant effects of movement direction were recorded upon velocity profiles. The acceleration time, computed relative to total movement time, was greater for downward movements than for upward movements. In contrast however, no effects of load or speed were observed. Movement time was not affected by movement direction or load, for both speeds tested. These results suggest different planning processes, for movements with and against gravity and indicate that gravitational force influences the processes controlling movement execution.

Publication Date


  • 1998

Citation


  • Papaxanthis, C., Pozzo, T., & Stapley, P. (1998). Effects of movement direction upon kinematic characteristics of vertical arm pointing movements in man. Neuroscience Letters, 253(2), 103-106. doi:10.1016/S0304-3940(98)00604-1

Scopus Eid


  • 2-s2.0-0032483423

Start Page


  • 103

End Page


  • 106

Volume


  • 253

Issue


  • 2