Global ETD Search
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Showing 1 to 20 of 67 for “"saccades"”.
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Characterizing the Brain Dynamics and Eye Movement Behavior of Memory-Guided Saccades: a Preliminary Investigation of Distractor Influence on Memory-Guided Saccades
… mechanisms of distractors on memory-guided saccades. In our current study we have utilized eye tracking and EEG technology to simultaneously record the changes in saccadic eye movement (SEM) behavior and event-related potentials (ERPs) associated with performance on a memory-guided saccade …
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The Parameters of Eye Movement in Vocal Music Reading (sight-Reading; Saccades)
The purpose of the study was to investigate selected aspects of perceptual processing of graduate music students reading melodies of varying levels of notational complexity. Six parameters of eye movement were measured using an SRI Eytracker: number of progressive and regressive fixations, …
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Analysis of Eye Movements to Cartoon Faces in Videos
<p>Saccades are rapid eye movements that move our gaze between successive points of fixation. They are indicative of how we direct our attention and therefore play a role in memory and cognition. For static images, it is established that saccades move faster to faces compared to other objects. We …
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Contribution of Vision and Proprioception to the Precision of Reaching Movements
Ren and colleagues (2006) found that saccades to visual targets became less accurate when somatosensory information about hand location was added, suggesting that saccades rely mainly on vision. We conducted two kinematic experiments to examine whether or not reaching movements would also show such …
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Role of the Parabigeminal Nucleus in Predictive Tracking of Moving Targets
… good. SC cells reset their activity during saccades to virtual targets, but only for contraversive saccades, whereas the PBN resets for both ipsiversive and contraversive saccades. Finally, SC responses are enhanced by good attentiveness, but only for the real targets.
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Microsaccades
… in our head. Eye movements can be split into saccades and fixational eye movements, which occur when we attempt to fixate our gaze. The latter consists of microsaccades, drift and tremor. Before we even lift our eye lids, eye movements – such as saccades and microsaccades that let the eyes …
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Single Unit and Population Analysis of Saccade-related Fastigial Nucleus Activity in the Alert Monkey
… latencies for contralateral than for ipsilateral saccades. This pattern of burst timing indicates that the bursts are associated with the beginning of contralateral saccades and with the end of ipsilateral ones. We have investigated (1) whether or not the initial eye position has an effect on …
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Small eye movements during fixation : the case of postsaccadic fixation and preparatory influences
… movement behavior as an alternating sequence of saccades and fixations turns out to be an oversimplification because the eyes continue to move during fixation. Small-amplitude saccades (e.g., microsaccades) are typically observed 1-2 times per second during fixation. Research on microsaccades …
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In-between fixation and movement : on the generation of microsaccades and what they convey about saccade generation
Microsaccades are an important component of the small eye movements that constitute fixation, the basis of visual perception. The specific function of microsaccades has been a long-standing research problem. Only recently, conclusive evidence emerged, showing that microsaccades aid both visual …
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Pre-Saccadic Modulation of the Visually Evoked Potential
<p>Saccades are rapid eye movements that allow us to focus the fovea on different parts of our visual environment. Many psychophysical studies have shown that subjects can discriminate stimuli presented at the saccadic target better than at any other location before an eye movement is made. It is …
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Dependence of Visuomotor Behavior on Individual Layers of the Cat Lateral Geniculate Nucleus in the Normal Brain and Following Recovery From Destruction of Individual Layers
… role than the C layers for both visually guided saccades and for the activity of the cells in cortex which project to the superior colliculus, the structure generating saccades. During layer-A reversible inactivations, saccade success rate fell from 82.4% to 26.8%. Inactivations lowered amplitude …
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Influence of direction and eccentricity on pro- and anti-saccade metrics
… eccentricities along the horizontal. Pro-saccades had faster SRTs and velocities, larger amplitudes, higher accuracy and less variation in their trajectories than anti-saccades. Pro- and anti-saccade performance was shown to exhibit a similar dependence on both saccade goal direction and …
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Eye movement control during reading : factors and principles of computing the word center for saccade planning
… Reichle, Rayner, & Pollatsek, 2003). However, saccades’ landing positions within words during reading are in fact systematically modulated by the distance of the launch site from the word center (McConkie, Kerr, Reddix, & Zola, 1988). In general, it is largely unknown how readers identify the …
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Using Eye Movements to Establish a Normative Database of Control Participants Across the Lifespan
… anti-saccade task requires the generation of pro-saccades (automatic eye movements toward a salient stimulus) and/or anti-saccades (voluntary eye movements away from a salient stimulus) depending upon a visual colour instruction. Participant head position was stabilized using a fixed head mount …
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Cortical Mechanisms for Transsaccadic Perception of Visual Object Features
… information across rapid eye movements, or saccades; Irwin, 1991) have been little investigated. Previously, Dunkley et al. (2016) found evidence of transsaccadic updating of object orientation in specific intraparietal (i.e., supramarginal gyrus, SMG) and extrastriate occipital (putative …
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Role of the Parabigeminal Nucleus in Visuomotor Behavior
… moving targets primarily with small catch-up saccades, and for target speeds of 2--6 deg/s, they did so with sufficient accuracy to keep targets within 2.5 deg of the visual axis most of the time. During intersaccade intervals of such close-order tracking, PBN cells fired at rates related to …
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Optogenetic disruption of memory-drive, oculomotor behavior in the non-human primate
… eye field (FEF) is critical for executing saccades to remembered locations. FEF neurons increase their firing rate during the three epochs of the memory-guided saccade task: visual stimulus presentation, the delay interval, and motor preparation. It is unclear, though, whether FEF activity …
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The return-sweep in reading.
… the basic characteristics of return-sweep saccades. The reported data indicates that return-sweeps follow one of two trajectories: they land close enough to their target to enable readers to begin a rightwards pass or they are followed by a corrective saccade towards the left margin. When …
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System-level attention links cognition, perception and action: Evidence from language comprehension and eye movements
… on two types of eye movements, pursuit and saccades, were explored in nine eye-tracking experiments. Empirical findings suggested that a) eye velocity during pursuit was systematically modulated by verb semantics; depending on whether there was agreement or conflict between representations …
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