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  • 1
    Electronic Resource
    Electronic Resource
    Arthrokinetic nystagmus and ego-motion sensation (1977)
    Springer
    Experimental brain research 30 (1977), S. 331-338 
    Details
    ISSN: 1432-1106
    Keywords: Arm movement ; Joint receptors ; Nystagmus ; Circularvection ; Man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A compelling illusion of body rotation and nystagmus can be induced when the horizontally extended arm of a stationary subject is passively rotated about a vertical axis in the shoulder joint. Lateral nystagmus with the fast phase beating in the opposite direction to the arm movement was found consistently; the mean slow phase velocity increased with increasing actual arm velocity and reached about 15 °/sec; the mean position of the eyes was deviated towards the fast phase as in optokinetic nystagmus, and the nystagmus continued after the cessation of stimulation (arthrokinetic after-nystagmus). The existence of an arthrokinetic circularvection and nystagmus indicates a convergence of vestibular and somatosensory afferents from joint receptors. It is concluded that information about joint movements plays an important role within the multisensory processes of self-motion perception.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237260
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Differential effects of central versus peripheral vision on egocentric and exocentric motion perception (1973)
    Springer
    Experimental brain research 16 (1973), S. 476-491 
    Details
    ISSN: 1432-1106
    Keywords: Optokinetic stimulation ; Motion perception ; Circularvection ; Spatial orientation ; Peripheral visual field
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Optokinetic stimuli allow for two perceptual interpretations. The observer may perceive himself as being stationary in a moving surround (egocentric motion perception) or he may experience an illusion of self-motion, so that the actually moving surroundings appear to be stable (exocentric motion perception). Results 1. Circular motion of the entire surroundings (rotating drum) invariably leads to an apparent self-rotation (circularvection: CV), which is indistinguishable from an actual chair rotation. 2. Following stimulus onset, CV begins after a few seconds latency and slowly increases its apparent velocity until its saturation. CV may outlast the visual stimulus by as much as 30 sec. Latencies are independent of stimulus velocity. 3. Even with drum accelerations up to 15°/sec2, stationary subjects cannot infer from the lack of vestibular input that only the drum is rotating. 4. With stimulation of the entire visual field or sufficiently large parts of the peripheral retina, the velocity of apparent self-rotation matches stimulus speed up to 90–120°/sec. At higher speeds, CV velocity lags behind stimulus speed and results in additional egocentric motion perception. 5. Masking the central visual field by black disks up to 120° in diameter scarcely diminishes CV. Conversely, if peripheral vision is precluded, stimulation of the central field up to 30° in diameter results in exclusive egocentric motion perception of the surround. With a central and peripheral stimulus equivalent in area, the peripheral stimulus predominates CV. 6. Simultaneous presentation of conflicting central and peripheral optokinetic stimuli (i.e., stimuli rotating in opposite directions) has shown that exocentric orientation depends on the peripheral stimulus whereas optokinetic nystagmus and egocentric motion perception rely on the center of the visual field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234474
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Optisch induzierte Pseudocoriolis-Effekte und Circularvektion (1971)
    Springer
    European archives of psychiatry and clinical neuroscience 214 (1971), S. 365-389 
    Details
    ISSN: 1433-8491
    Keywords: Optokinetic Stimulation ; Semicircular Canal Stimulation ; Circularvection ; Magnitude Estimation ; Coriolis-Effect ; Visual Pseudo-coriolis-Effect ; Dizziness ; Man ; Optokinetik ; Bogengangsreizung ; Circularvektion ; Größenschätzung ; Coriolis-Effekt ; optischer Pseudocoriolis-Effekt ; Schwindel ; Mensch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Circularvektion und Coriolis-Phänomene wurden mit kombinierten und isolierten optokinetischen und vestibulären Drehreizen untersucht. Diese wurden durch einen Drehstuhl und eine konzentrisch dazu angeordnete zylindrische Drehtrommel dargeboten. Die durch Kopfneigung ausgelösten Coriolis-Effekte wurden durch Größenskalierung (magnitude estimation) bestimmt und Augenbewegungen, EKG sowie Atmung simultan registriert. Ergebnisse 1. Stuhl- und Trommelrotation können subjektiv nicht unterschieden werden. In beiden Fällen tritt dominant eine Eigendrehempfindung (Circularvektion) auf. Zusätzliche ortsstabile akustische Reize werden in die Eigendrehempfindung integriert. 2. Durch Kopfneigungen bei rein optokinetischem Reiz (Trommelrotation) werden Pseudocoriolis-Effekte ausgelöst, die qualitativ nicht von den vestibulären Coriolis-Effekten unterschieden werden können. 3. Die optisch-optomotorische Bewegungskontrolle (bei offenen Augen) hemmt die vestibulär ausgelösten Coriolis-Effekte richtungsspezifisch. 4. Optische Pseudocoriolis-Effekte und die Hemmung der visuellen auf die vestibuläre Afferenz sind bis zu 30 sec nach Ende des optischen Reizes nachweisbar. 5. Die stärksten Coriolis-Effekte treten bei Richtungsinkongruenz optischer und vestibulärer Bewegungsinformationen auf. Die Ergebnisse werden für die optisch-vestibuläre Integration bei Bewegungswahrnehmung und Schwindel diskutiert.
    Notes: Summary Circular vection and Coriolis effects were investigated with combined as well as with separate optokinetic and vestibular rotational stimuli using a rotary chair located inside a cylindrical rotatable drum. Coriolis effects which were elicited by tilting of the head were measured by means of the magnitude estimation technique. Bye movements, ECG, and respiration rate were simultaneously recorded. Results 1. Chair and drum rotation could not be distinguished subjectively. In both cases the experience of self-rotation (circular vection) predominated. Furthermore additional stationary acoustical stimuli were integrated into this experience. 2. Tilting of the head during pure optokinetic stimulation (rotation of the drum) produced a Pseudocoriolis effect which could not be qualitatively distinguished from the Coriolis effect produced by pure vestibular stimulation (rotation of the chair). 3. Optical-optomotor movement control (with the eyes open) inhibited the Coriolis effect produced by vestibular stimuli. This inhibition was directionally specific. 4. The visual Pseudocoriolis effect as well as the visually induced inhibition of vestibular afference outlasted the visual stimulus by up to 30 sec. 5. The strongest Coriolis-effects occurred when visual and vestibular movement information did not match. The results are discussed in terms of their significance for visual-vestibular integration in movement perception.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342671
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    Paper (German National Licenses)
    Fulltext
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