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2 edition of Aspects of saccadic eye-movements towards or away from photopic, mesopic, or scotopic stimuli found in the catalog.

Aspects of saccadic eye-movements towards or away from photopic, mesopic, or scotopic stimuli

Hansraj Doma

Aspects of saccadic eye-movements towards or away from photopic, mesopic, or scotopic stimuli

by Hansraj Doma

  • 213 Want to read
  • 33 Currently reading

Published by University of Toronto, Department of Physiology in Toronto .
Written in English

    Subjects:
  • Eye -- Movements,
  • Physiological optics.,
  • Visual perception

  • Edition Notes

    Bibliography: p. 14-15.

    StatementHansraj Doma, Peter E. Hallett.
    SeriesTechnical reports on research in biological and computational vision at the University of Toronto -- RBCV-TR-86-11
    ContributionsHallett, Peter E.
    Classifications
    LC ClassificationsQP477.5 D66 1986
    The Physical Object
    Paginationiii, 15 p. :
    Number of Pages15
    ID Numbers
    Open LibraryOL21774787M

      Disclaimer. Oxford University Press makes no representation, express or implied, that the drug dosages in this book are correct. Readers must therefore always check the product information and clinical procedures with the most up to date published product information and data sheets provided by the manufacturers and the most recent codes of conduct and safety regulations. Saccadic eye movements were executed in response to two red spots visual stimuli (3 mm diameter) projected onto a translucent screen placed cm in front of the subject’s eyes. One spot was fixed, acting as central fixation point for the subject and the other one (target) could be moved at the left or at the right of the central fixation point.

    For assistance, please contact: AAN Members () or () (International) Non-AAN Member subscribers () or () option 3, select 1 (international). iconic memory has commonly been assumed to be eliminated by eye movements, one study (Germeys et al. ) presented evidence that such a representation could survive and be spatially updated with the saccade. However, this transsaccadic informational persistence was masked by the presence of stimuli after the saccade.

    Ocular Motility Saccadic Eye Movements. STUDY. PLAY. purpose of the saccadic eye movement system? to place the image on the fovea as rapidly as possible. how rapid is a saccadic eye movement? degs of arc/sec. testing saccadic eye movements methods?-observers nose as reference point. Saccadic Omission is the fact that during saccadic eye movements, we do not appear to see. (No blur) the ocular motor system dominate ret. slip signal the threshold for detecting light during a saccade .


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Aspects of saccadic eye-movements towards or away from photopic, mesopic, or scotopic stimuli by Hansraj Doma Download PDF EPUB FB2

Also central delay may be more difficult for mesopic stimuli, and so DE saccades may be frequent, because the double burst may constitute a "double request" to foveate.* In summary, the latency, accuracy, and pat- tern of saccadic eye movements are highly de- pendent on stimulus luminance but in a manner that is sensitive to by:   Visual functions under scotopic, mesopic and photopic illumination.

The luminance level (log cd.m-2) is the reference for estimating pupil diameter using the empirical relation between pupil diameter (mm) and field luminance (Crawford, ; Pokorny and Smith, ).The reported values align approximately with the photopic retinal illuminance (photopic Troland is shown in bold) of the Cited by: L.

Aspects of saccadic eye-movements towards or away from photopic, in Encyclopedia of Neuroscience, Conclusion. Saccadic eye movements are an important component of the animal’s behavior for exploring and spatially organizing its sensory environment.

They provide a useful tool for understanding how the central nervous system relates the sensorium with the motor repertoire. Visual sensitivity is dynamically modulated by eye movements. During saccadic eye movements, sensitivity is reduced selectively for low-spatial frequency luminance stimuli and largely unaffected.

Doma H. and Hallett P. () Aspects of saccadic eye movements towards or away from photopic, mesopic and scotopic stimuli. Research in Biological and Com- -sccondary-amplitudc and other analyses of the present data are given in Kalesnykas (). pulalional Vision, Univ.

of Toronto, Tcch. Rep. RBCV- TR van Gisbergen J., Gielen S Cited by: 6. The problem of moving the eyes to fixate a new target in space (or indeed any other movement) entails two separate issues: controlling the amplitude of movement (how far), and controlling the direction of the movement (which way).

The amplitude of a saccadic eye movement is encoded by the duration of neuronal mesopic in the lower motor neurons of the oculomotor nuclei. When the average luminance increases from scotopic or mesopic to photopic levels at least s before the offset of the first frame, motion in the 3pi/2 direction is perceived.

The scotopic to photopic transition was tested in adults and week-old infants using a large field motion nulling technique at a series of luminances between − and log cd m − stimuli were composed of cyc deg −1, Hz blue/black and yellow/black sinusoidal grating components, superimposed and moving in opposite directions.

The illuminance for observation was varied from to lx to cover scotopic, mesopic, and photopic vision, and the equivalent lightness-versus-log illuminance curve was obtained for every. During saccadic eye movements, we do not perceive the world as moving. This observation is paradoxical because high-speed retinal motion can be detected with static eyes, provided it.

Eye movements are an important index of the neural functions of visual information processing, decision making, visuomotor coordination, sports performance, and so forth.

However, the available optical tracking methods are impractical in many situations, such as the wearing of eyeglasses or the presence of ophthalmic disorders, and this can be overcome by accurate recording of eye movements.

The main sequence: A tool for studying human eye movements. Mathematical Biosciences, 24, (). Bahill, A.T., and Stark, L. The trajectories of saccadic eye movements. Scientific American,(). Baloh, R.W., and Honrubia, V.

Reaction time and accuracy of the saccadic eye movements of normal subjects in a moving-target task. Interactions between rod and cone signals affect many aspects of mesopic stimuli, and eye movements combine to produce visual behavior, seems elusive.

and patients with AMD for scotopic. During fixation, the eye tends to drift slowly away from the fixation point, but eventually, fixation is restored by a rapid jump movement called a saccade Saccades are very fast, velocities ranging up to °/s depending upon the distance moved Saccadic eye movements have a latency of about ms, which limits how frequently the line of.

Around the time of saccadic eye movements visual sensitivity is greatly reduced (29, 30), spatial positions are perceptually shifted toward the saccade target, and empty visual space is compressed. Thus, object tracking with a combination of smooth pursuit and saccadic eye movements presents a challenging task for our visual system.

greater before saccadic eye movements to the RF stimulus and 1 responded greater before eye movements directed away from the RF. Cells that responded significantly greater when eye movements were directed to RF stimuli were enhanced by a median factor of However, the likelihood of a cell showing enhancement depended on which stimulus was.

In this task, the monkeys were trained to make saccadic eye movements to stable visual stimuli presented within the visual receptive field (RF) of a V4 neuron. The response of a V4 neuron during the saccade task is shown in Fig.

The responses of the neuron during the first half of each trial are aligned to the onset of the visual stimulus. saccadic eye movement: [sakad′ik] an extremely fast voluntary movement of the eyes, allowing them to accurately refix on an object in the visual field.

The mesopic luminance region, about cd/m2, lies in between the scotopic and photopic. The new mesopic system describes spectral luminous efficiency, Vmes (Γ), in the mesopic region as a.

Around the time of saccadic eye movements visual sensitivity is greatly reduced (29, 30), spatial positions are perceptually shifted toward the saccade target (31), Significance Intensive research has focused on the question of how the vi-sual system distinguishes between and accounts for retinal motion caused by eye movements or by physical object.

The extant research literature concerning intrasaccadic stimuli implies that if a spot of light is flashed in the dark during a saccadic eye movement, one should subsequently look for the light in one direction while professing to see it lying in another.

This paper accounts for this paradox in terms of two hypothesized varieties of sensed eye orientation, one estimating actual eye orientation.Start studying Saccadic Eye Movements.

Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. This usually manifests as a drift of the eyes toward the primary position. Saccades generated to novel stimuli (visual, auditory, or tactile) that unexpectedly occur in. Matin, L. & Pearce, D.G.

Visual perception of direction for stimuli flashed during voluntary saccadic eye movements. Science– (). CAS Article Google Scholar.