Kinesthetic perceptions of intrinsic anterior-posterior axes

Experimental Brain Research
W G Darling, T E Williams

Abstract

The purpose of this research was to investigate whether kinesthetic and proprioceptive perceptions of "straight ahead" were defined by a head- or trunk-fixed axis. Subjects were instructed to align the forearm with the head or trunk anterior-posterior (a/p) axis by elbow flexion or extension in the horizontal plane in five different conditions. In each condition the experimenter varied initial elbow and shoulder horizontal flexion or extension angles and head and/or trunk orientation (by rotation about a vertical axis) on each trial before the subject moved the forearm to align it with the head or trunk axis. The upper limb motion was voluntarily constrained to the horizontal plane through the shoulder. Variable errors were significantly lower when subjects aligned the forearm to the trunk-fixed a/p axis. Furthermore, the perceptual errors showed a greater dependence on body segment orientations when the forearm was aligned to the head axis than to the trunk axis. We conclude that the trunk a/p axis is preferred to the head a/p axis for specifying upper limb segment orientations in the horizontal plane at the kinesthetic perceptual level.

Citations

Dec 16, 2006·Experimental Brain Research·W G DarlingA J Butler
Feb 25, 2011·Experimental Brain Research·Johanna ReuschelKatja Fiehler
Feb 18, 2004·Journal of Neurology, Neurosurgery, and Psychiatry·W G DarlingM Rizzo
Jun 9, 2000·Annual Review of Physiology·K G Pearson
Jun 20, 2001·Developmental Neuropsychology·C GabbardV Gentry
Mar 31, 2000·Brain and Cognition·W G Darling, M Pizzimenti
Feb 20, 2003·Experimental Brain Research·Warren G Darling, Robert Bartelt

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