ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Influence of otolithic stimulation by horizontal linear acceleration on optokinetic nystagmus and visual motion perception (1980)

Buizza, A. ; Léger, A. ; Droulez, J. ; [et al.]

Springer

Experimental brain research 39 (1980), S. 165-176

add to mindlist on the mindlist

Details

ISSN: 1432-1106

Keywords: Vestibular system ; Optokinetic ; Otoliths ; Eye movements ; Motion perception

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Several studies in the past have demonstrated the existence of an Otolith-Ocular Reflex (OOR) in man, although much less sensitive than canal ocular reflex. The present paper 1 confirms these previous results. Nystagmic eye movements (L-nystagmus) appear in the seated subject during horizontal acceleration along the interaural axis in the dark for an acceleration level (1 m/s2) about ten times the perception threshold with a sensitivity of about 0.035 rad/m. When sinusoidal linear acceleration is combined with optokinetic stimulation, the recorded nystagmus slow phase velocity exhibits strong periodic modulation related to subject motion. This marked effect of linear acceleration on the optokinetic nystagmus (OKN) appears at a level (0.1 m/s2) close to the acceleration perception threshold and has a 4-fold higher sensitivity than L-nystagmus. Modulation of OKN can reach a peak-to-peak amplitude as great as 20 °/s; for a given optokinetic field size it increases with the velocity of the optokinetic stimulus, i.e. with the slow phase eye velocity. In parallel with changes in OKN slow phase velocity, linear acceleration induces a motion related decrease in the perceived velocity of the visual scene and modifications in selfmotion perception. The results are interpreted in terms of a mathematical model of visual-vestibular interaction. They show that sensory interaction processes can magnify the contribution given to the control of eye movements by the otolithic system and provide a way of exploring its function at low levels of acceleration.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00237547

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Darstellung und Kristalldaten von LiBa2EuO4 (1967)

Bärnighausen, H. ; Schmid, R. D.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 354 (1967), S. 27-29

add to mindlist on the mindlist

Details

ISSN: 0044-2313

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: The new quaternary compound LiBa2EuO4 may be prepared from stoichiometric amounts of LiEuO2 and BaO by heating at 700°C under an inert atmosphere. According to Debye-Scherrer photographs. LiBa2EuO4 and LiEu3O4 are isostructural (space group Pbnm). The orthorhombic unit cell with a = 11.883, b = 12.130 and c = 3.601 Å contains 4 formula units LiBa2EuO4 (calculated density 6.369 g/cm3).

Notes: Die neue quaternäre Verbindung LiBa2EuO4 kann aus den stöchiometrisch erforderlichen Mengen LiEuO2 und BaO durch Erhitzen bei 700°C unter Schutzgas erhalten werden. Wie aus DEBYE-SCHERRER-Aufnahmen hervorgeht, ist LiBa2EuO4 mit LiEu3O4 isotyp (Raumgruppe Pbnm). Die rhombische Elementarzelle mit a = 11,883, b = 12,130 und c = 3,601 Å enthält 4 Formeleinheiten LiBa2EuO4 (berechnete Dichte 6,369 g/cm3).

Additional Material: 1 Tab.