Effects of gymnastics expertise on the perception of body orientation in the pitch dimension.

The purpose of this study was to investigate how experts in motor skills requiring a fine postural control perceive their body orientation with few gravity based sensory cues. In Experiment 1, expert gymnasts and controls had to detect their body tilt when pitching at a velocity of 0.05 deg.s(-1), in two conditions of body restriction (strapped and body cast altering the somatosensory cues). Contrary to the experts, the controls exhibited a larger body tilt when totally restrained in the body cast. In Experiment 2, subjects had to estimate their Subjective Postural Vertical (SPV) starting from different angles of pitch tilt. The controls exhibited significant errors of SPV judgement whereas the experts were very precise. These results suggest that 1) somatosensory cues are more informative than otolithic cues for the perception of body orientation, and 2) the efficiency of otolithic and/or interoceptive inputs can be improved through a specific training to compensate for the lack of somatosensory cues.

[1]  Ian P. Howard,et al.  Human visual orientation , 1982 .

[2]  A. J. Benson,et al.  Thresholds for the perception of whole body angular movement about a vertical axis. , 1989, Aviation, space, and environmental medicine.

[3]  J R Lackner,et al.  Some influences of touch and pressure cues on human spatial orientation. , 1978, Aviation, space, and environmental medicine.

[4]  R. Fitzpatrick,et al.  Proprioceptive, visual and vestibular thresholds for the perception of sway during standing in humans. , 1994, The Journal of physiology.

[5]  J. G. Nelson.  Effect of water immersion and body position upon perception of the gravitational vertical. , 1968, Aerospace medicine.

[6]  D M Merfeld,et al.  Humans use internal models to estimate gravity and linear acceleration , 1999, Nature.

[7]  H. E. Vongierke,et al.  Differences in otolith and abdominal viscera graviceptor dynamics: implications for motion sickness and perceived body position. , 1994, Aviation, space, and environmental medicine.

[8]  L. Young,et al.  A multidimensional model of the effect of gravity on the spatial orientation of the monkey. , 1993, Journal of vestibular research : equilibrium & orientation.

[9]  A M Bronstein,et al.  The perception of body verticality (subjective postural vertical) in peripheral and central vestibular disorders. , 1996, Brain : a journal of neurology.

[10]  Victor S. Gurfinkel,et al.  Postural control in weightlessness: a dual process underlying adaptation to an unusual environment , 1988, Trends in Neurosciences.

[11]  H Mittelstaedt,et al.  The influence of otoliths and somatic graviceptors on angular velocity estimation. , 1996, Journal of vestibular research : equilibrium & orientation.

[12]  J R Lackner,et al.  Multimodal and motor influences on orientation: implications for adapting to weightless and virtual environments. , 1992, Journal of vestibular research : equilibrium & orientation.

[13]  H Mittelstaedt,et al.  Somatic versus Vestibular Gravity Reception in Man , 1992, Annals of the New York Academy of Sciences.

[14]  L Mouchnino,et al.  Body orientation and regulation of the center of gravity during movement under water. , 1995, Journal of vestibular research : equilibrium & orientation.

[15]  D. Glencross,et al.  Expert perception and decision making in baseball. , 1997 .

[16]  H Mittelstaedt,et al.  Interaction of eye-, head-, and trunk-bound information in spatial perception and control. , 1997, Journal of vestibular research : equilibrium & orientation.

[17]  H E Ross,et al.  Orientation to the vertical in free divers. , 1969, Aerospace medicine.

[18]  Bert H. Jacobson,et al.  The Effect of T'AI Chi Chuan Training on Balance, Kinesthetic Sense, and Strength , 1997, Perceptual and motor skills.

[19]  N. Teasdale,et al.  Contribution of ankle, knee, and hip joints to the perception threshold for support surface rotation , 1999, Perception & psychophysics.

[20]  M. Michalopoulou,et al.  Differences in Several Perceptual Abilities between Experts and Novices in Basketball, Volleyball and Water-Polo , 1998, Perceptual and motor skills.

[21]  M M Cohen,et al.  Visual and somesthetic influences on postural orientation in the median plane , 1993, Perception & psychophysics.

[22]  A M Bronstein,et al.  The Interaction of Otolith and Proprioceptive Information in the Perception of Verticality: The Effects of Labyrinthine and CNS Disease , 1999, Annals of the New York Academy of Sciences.

[23]  J. Lackner.  Some proprioceptive influences on the perceptual representation of body shape and orientation. , 1988, Brain : a journal of neurology.

[24]  A GRAYBIEL,et al.  Perception of the postural vertical in normals and subjects with labyrinthine defects. , 1963, Journal of experimental psychology.

[25]  Ross He,et al.  Orientation to the vertical in free divers. , 1969 .