Effects of Optokinetic Stimulation on Body Sway

Taguchi, K; Kikukawa, Masato

doi:10.1159/000410317

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The change in the signals coming from the ankle muscles and tendon receptors stimulated by the new position of the ankle joint would no longer be interpreted as the result of a forward body tilt, and consequently the body inclination would not be canceled after the visually-induced response had gone. Experiments with labyrinthine-defective patients have shown similar results (23), suggesting that the absence of graviceptors (otoliths) might also be involved in this aspect of the response.…”

Section: Effects Of Weightlessnessmentioning

confidence: 60%

Postural Reactions Induced by Vertical Motion of Visual Scenes and the Effects of Weightlessness

Clément

1998

Acta Oto-Laryngologica

View full text Add to dashboard Cite

Postural reactions induced by vertical optokinetic stimulation were recorded for 5 subjects in a ground-based study, and for one astronaut before, during, and after a 25-day spaceflight. On the ground, the amplitude of visually-induced postural reactions generally increased with stimulus velocity and saturated around 60 degrees/s, with an angle of body tilt which never exceeded 2-3 degrees. For velocities higher than 20 degrees/s, backward body tilt during upgoing optokinetic stimulation was larger than forward body tilt during downgoing stimulation. In weightlessness, the angle of body tilt was reduced compared to ground values, but after the flight the postural reactions were larger than before the flight. If the limited angle of body tilt on Earth is due to an inhibition from the graviceptive inputs which do not confirm the visual inputs, the larger angle of tilt might reflect that this inhibition was less effective after spaceflight. This ineffectiveness might reflect a confusion between body tilt and translation as the result of adaptation to weightlessness.

show abstract

Section: Effects Of Weightlessnessmentioning

confidence: 60%

Postural Reactions Induced by Vertical Motion of Visual Scenes and the Effects of Weightlessness

Clément

1998

Acta Oto-Laryngologica

View full text Add to dashboard Cite

show abstract

“…Up to now, the authors who examined the visual-spinal reflex mainly focused on the interaction between the parafoveal and/or more peripheral retinal areas and the spinal reflex [7,8]. The visual stimuli for these examinations were given optokinetically.…”

Section: Why Is There a Difference In The Results Between Oe And Vf?mentioning

confidence: 99%

Difference between Visual Feedback and Visual Suppression upon the Stabilization of Body Sway in Normal Subjects

Ohashi¹,

Nakagawa²,

Mizukoshi³

1990

ORL

View full text Add to dashboard Cite

We developed a system to feedback the center of foot pressure by vision using a microcomputer. The subjects were instructed to adjust the center of foot pressure (displayed on the computer display at real time) to the point of intersection of the two stable (horizontal and vertical) lines on the computer display. The peak of the power spectra of body sway shifted significantly to the higher frequency range in the Y component (the lateral direction) in the visual feedback condition. Thus, we conclude that the visual feedback of body sway depends mainly on the error signals between the fovea and the image in the lateral direction to stabilize body sway.

show abstract

“…Mit Hilfe der Statokinesimetrie stellten Taguchi u. Mitarb. [5] bei horizontaler optokinetischer Stimulation eine Rechts-Links-Verbreiterung, bei vertikaler optokinetischer Reizung eine Verstärkung der Aufzeichnung in Anterior-Posterior-Richtung fest. Gantchew [6] fand ein Ansteigen der Körperschwankungen bei optokinetischer Stimulation, aber keine quantitative Korrelation zwischen Streifenbewegung und Gröûe der Körperschwankungen.…”

unclassified

“…Die stärkere Belastung des linken Fuûes beim torsionalen Musterablauf entgegen dem Uhrzeigersinn hing wahrscheinlich mit der ungewohnten Art dieses Reizes zusammen, wobei der Informationskonflikt eine Situation verstärkt, die schon in Ruhe zur Erhaltung der Standstabilität bevorzugt wird. Hierdurch erklärt sich auch die signifikante Verbesserung des Mittelwertes des SI bei horizontalem Streifenablauf nach links, da Mustergeschwindigkeiten oberhalb 60 8/s Körperabweichungen in gleicher Richtung hervorrufen[5].Die verwandte statische Plattform erlaubt es, neue Erkenntnisse über die Einwirkung standardisierter horizontaler, vertikaler und torsionaler optokinetischer Reize auf die Standstabilität zu erzielen, wobei die Erhöhung des Fersendruckes unter diesen Bedingungen besonders interessant ist. Insgesamt sind die Auswirkungen der hier angewandten Stimuli aber so gering, dass sie schon sehr früh in Trainingsprogrammen bei Patienten mit akuten vestibulären Defiziten zur Habituation ihres Gleichgewichtsverhaltens[23 ± 25] angewandt werden können.…”

unclassified