Search results for "Video-oculography"
showing 3 items of 3 documents
Torsional eye movement responses to monaural and binaural galvanic vestibular stimulation: side-to-side asymmetries.
2003
Vestibular stimulation by head accelerations always involves multisensory activation of the vestibular, somatosensory, and visual systems. Over the past few years, galvanic vestibular stimulation (GVS) has become increasingly popular for testing vestibular function for clinical and research purposes. Although GVS provides a nonphysiological stimulation, it is more selective than natural head accelerations and is thus an attractive tool for such tests. Eye movement responses elicited by GVS mainly consist of torsional and horizontal components, as first described by Hitzig in 1871. Animal experiments have shown that GVS increases the vestibular afferent spike frequency at the cathodal site a…
Acu kustību iekārtu IViewX RED500 un EyeLink precizitātes salīdzinājums
2019
Darbs ir uzrakstīts latviešu valodā uz 34 lapaspusēm. Tas satur 23 attēlus, 28 atsauces uz literatūras avotiem. Darba mērķis ir novērtēt Latvijas Universitātē Optometrijas un redzes zinātnes nodaļā pieejamo acu kustību iekārtu IViewX RED500 un EyeLink 1000 Plus precizitāti. Iekārtu precizitāte tika novērtēta, izmantojot 13 pelēkus diska formas stimulus ar ārējo rādiusu 0,8° un iekšējo – 0,6°, kas tika izvietoti uz balta un melna fona. Dalībniekiem tika sniegts uzdevums apskatīt visus 13 stimulus vienu pēc otra. Iegūtie rezultāti norāda, ka IViewX RED500 un EyeLink 1000 Plus acu kustību iekārtu precizitāte nav būtiski atšķirīga. Novērots EyeLink 1000 Plus precizitātes samazinājās apskatot ek…
<title>Eye movements during silent and oral reading with stabilized versus free head movement and different eye-trackers</title>
2008
Eye movement research of reading has been done on a battery of eye-tracking setups during last decades. We compared reading data of the same group of six students, their eyes were tracked by a video-based helmet-mounted system with the data sampling frequency of 50 Hz and a setup with a chin-rest at 240 Hz. We found that not only the number of fixations may decrease after reading practice, but so does also the mean duration of fixations. In spite of the short duration of saccades, their distributions and changes in them are similarly reported in the two experimental conditions. Lack of significant correlation in the HED data testifies to the result variability due to measurement technique. …