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Conscious control of movements: increase of temporal precision in voluntarily delayed actions?

100%

Szelag E., Rymarczyk K., Poppel E.

Acta Neurobiologiae Experimentalis

2001

vol. 61

issue 3

175-179

The variability of simple actions with response to auditory stimuli was studied under different delay conditions. Subjects reacted as fast as possible or with a defined time delay (from 250 to 750 ms) to a tone switching off by pressing a response-key with the left index finger (controlled by the right hemisphere) or with the right one (left hemisphere). For short delays (requested response times below 350 ms) variability of responses was much larger then for longer delays (above 350 ms), especially for the right hand. Thus, precise temporal control on consciously mediated actions sets only in after a rather long delay (in some cases after half a second). Neuronal mechanisms underlying conscious temporal control of actions appear to be different for the two hemispheres.

Age-related differences in performance of stereotype arm movements: movement and posture interaction

88%

Błaszczyk J. W., Lowe D. L., Hansen P. D.

Acta Neurobiologiae Experimentalis

1997

vol. 57

issue 1

49-57

Postural destabilizations in response to cyclic pull and push arm movements were compared in young and elderly subjects, with the goal of determining how age related differences in postural stability influence strategies of cyclic arm movements made at different speeds, against different loads and while standing on support surfaces of different compliances. The results show that elderly subjects performed the experimental task more slowly with a lower mean movement frequency and a smaller amplitude. Despite of this fact, the elderly's upright posture was destabilized by this movement to a greater extent than in young subjects. The older adults exhibited lower damping of the disturbing torques produced by arm movements as evidenced by a higher amplitude of the center of foot pressure excursions. The results document close reciprocal motor and posture interaction and indicate that parameters of the voluntary movement task such as cyclic arm movements might be used as a sensitive measure of postural stability.

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2 Acta Neurobiologiae Experimentalis

1 2001

1 1997

1 Błaszczyk J. W.

1 Hansen P. D.

1 Lowe D. L.

1 Poppel E.

1 Rymarczyk K.

1 Szelag E.

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Conscious control of movements: increase of temporal precision in voluntarily delayed actions?

Age-related differences in performance of stereotype arm movements: movement and posture interaction