Saccades during symmetrical vergence

Abstract

Chronometry of saccades during vergence suggests that they do not participate to vergence triggering, and that prefrontal control of vergence previously reported was not mediated by saccades.

Visual demand and visual field presentation influence natural scene processing

“…First, our use of a fixation cross permanently overlapping the appearance of lateral stimuli, together with their close eccentricities, minimized the probability of the occurrence of express saccades during the exposure of lateral stimuli (see Procedure). Second, our detection task offered the left visual field an advantage, whereas motor biases of the eyes are rather rightward as evidenced for fixation [40], express saccades [41] or saccades during vergence [42]. With regard to spatial attention biases, Bowers et al [43] evidenced a left bias in normal adults performing a line bisection task under visual or tactile modality, which they termed pseudoneglect in reference to a mirror behavior of the left neglect following right parietal brain damage.…”

Functional activity within the frontal eye fields, posterior parietal cortex, and cerebellar vermis significantly correlates to symmetrical vergence peak velocity: an ROI-based, fMRI study of vergence training

“…The LED stimulus targets were located at the following three full vergence angle demands: 2, 3, and 4°. The target positions were chosen because smaller vergence movements have been shown to elicit fewer saccadic responses compared to larger vergence movements (Coubard and Kapoula, 2008; Semmlow et al, 2008, 2009; Chen et al, 2010). …”

Comment le cerveau contrôle-t-il les mouvements des yeux ? Les neurones moteurs et prémoteurs du tronc cérébral

“…Ce terme fut emprunté à l'astronomie où il fait ré fé rence à la relation é troite entre la luminosité d'une é toile et sa tempé rature. Lorsque les chercheurs dé couvrent des mouvements dont le type n'est pas encore connu, la sé quence principale peut aider à les identifier ou non comme é tant des saccades [7].…”

“…L'ambiguïté perceptive est ré duite plus avant quand les cibles sont visibles successivement et non pas simultané ment. Né anmoins, l'apparition successive des cibles n'empêche pas totalement l'apparition de petites saccades dans le cours de la vergence [7,24].…”