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Mouvements de la tête
Voluntary or involuntary motion of head that may be relative to or independent of body; includes animals and humans.
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Review: Head and Eye Movements and Gaze Tracking in Baseball Batting / Andrew J. Toole in OVS : Optometry & Vision Science, vol. 98, 07 (Juillet 2021)
[article]
in OVS : Optometry & Vision Science > vol. 98, 07 (Juillet 2021)
Titre : Review: Head and Eye Movements and Gaze Tracking in Baseball Batting Type de document : article de périodique Auteurs : Andrew J. Toole ; Nick Fogt Année de publication : 2021 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus HELB]:Paramédical:Entraînement sportif
[Thésaurus Mesh]Acuité visuelle
[Thésaurus Mesh]Baseball
[Thésaurus Mesh]Mouvements de la tête
[Thésaurus Mesh]Mouvements oculaires
[Thésaurus Mesh]Performance sportive
[Thésaurus Mesh]Vision oculaireMots-clés : contrôle visuo-moteur Résumé : SIGNIFICANCE: After a 30-year gap, several studies on head and eye movements and gaze tracking in baseball batting have been performed in the last decade. These baseball studies may lead to training protocols for batting. Here we review these studies and compare the tracking behaviors with those in other sports. Baseball batters are often instructed to “keep your eye on the ball.” Until recently, the evidence regarding whether batters follow this instruction and if there are benefits to following this instruction was limited. Baseball batting studies demonstrate that batters tend to move the head more than the eyes in the direction of the ball at least until a saccade occurs. Foveal gaze tracking is often maintained on the ball through the early portion of the pitch, so it can be said that baseball batters do keep the eyes on the ball. While batters place gaze at or near the point of bat-ball contact, the way this is accomplished varies. In some studies, foveal gaze tracking continues late in the pitch trajectory, whereas in other studies, anticipatory saccades occur. The relative advantages of these discrepant gaze strategies on perceptual processing and motor planning speed and accuracy are discussed, and other variables that may influence anticipatory saccades including the predictability of the pitch and the level of batter expertise are described. Further studies involving larger groups with different levels of expertise under game conditions are required to determine which gaze tracking strategies are most beneficial for baseball batting. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Stereothresholds during Voluntary Head Movement and Disconjugate Image Motion / Harold E. Bedell in OVS : Optometry & Vision Science, vol. 99, 01 (Janvier 2022)
[article]
in OVS : Optometry & Vision Science > vol. 99, 01 (Janvier 2022)
Titre : Stereothresholds during Voluntary Head Movement and Disconjugate Image Motion Type de document : article de périodique Auteurs : Harold E. Bedell ; Dorcas K. Tsang ; Michael T. Ukwade Année de publication : 2022 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Mouvements de la tête
[Thésaurus Mesh]Optométrie
[Thésaurus Mesh]Perception visuelle tridimensionnelle
[Thésaurus Mesh]Vision oculaireRésumé : SIGNIFICANCE
Stereothresholds increase in the presence of disconjugate image motion, whether this motion results from vergence errors that occur during active head movements or is imposed externally.
PURPOSE
During rapid voluntary oscillations of the head, vergence eye position has been reported to vary with a peak-to-peak amplitude of about 0.5°—a considerably greater amplitude than when the head is still. Concurrently, stereopsis was reported to be unaffected by voluntary head motion. In the present study, we measured stereothresholds during voluntary side-to-side head movements and during imposed disconjugate image motion with the head stationary, to simulate that produced during active head movement.
METHODS
Stereothresholds were measured for a pair of 30-arcmin bright vertical lines presented on an oscilloscope and viewed through a custom mirror haploscope. Data were obtained from four normal observers during voluntary side-to-side head movements at temporal frequencies up to 1.5 Hz and also while the head remained still. In addition, stereothresholds were measured with the head stationary when opposite rotations of the galvanometer-driven mirrors in each channel of the haploscope created disconjugate image motion to simulate vergence variability during active head movement.
RESULTS
During head motion, average stereothresholds increased from about 10 to about 14 arcsec. With imposed disconjugate image motion, stereothresholds rose systematically to about 35 arcsec when the peak-to-peak motion amplitude was 0.5°. Stereothresholds depend primarily on the amplitude of imposed motion and only marginally on variations of the disjunctive-motion wave form.
CONCLUSIONS
Stereothresholds are elevated modestly during active head movements. The results obtained with imposed disjunctive image motion are consistent with a previously proposal that stereothresholds vary according to the unsigned, time-averaged deviation of the stereotarget from the plane of the horopter.Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire