Facilitation of Stereopsis from a Large Disparity Random-Dot Stereogram by Various Monocular Features: Further Findings (A Short Note)

Perception ◽  
1976 ◽  
Vol 5 (4) ◽  
pp. 461-465 ◽  
Author(s):  
Ann Saye
Keyword(s):  
Control System ◽  
Eye Movements ◽  
Perceptual Learning ◽  
Eye Movement ◽  
Short Note ◽  
Movement Control ◽  
Saccadic Eye Movements ◽  
Eye Movement Control ◽  
Random Dot Stereogram ◽  
Initial Perception

This experiment examined the effects of adding five different kinds of prominent monocular features to a large-disparity random-dot stereogram. It was found that features which enclosed the disparate area produced the shortest initial perception times for fusion. The longer initial perception times for stimuli containing features without this enclosing property are explained in terms of less-helpful guidance of saccadic eye movements prior to the establishment of fusion. Subsequent reductions in perception times for these latter stimuli could be due to perceptual learning within the eye movement control system.

scholarly journals Catastrophe theory in work from heartbeats to eye movements

2021 ◽  
Author(s):  
Syed Hussain Ather
Keyword(s):  
Information Processing ◽  
Eye Movements ◽  
Eye Movement ◽  
Catastrophe Theory ◽  
Movement Control ◽  
Saccadic Eye Movements ◽  
System Of Equations ◽  
Eye Movement Control ◽  
Fast Control ◽  
Biological Organisms

AbstractIn "Slow-fast control of eye movements: an instance of Zeeman’s model for an action," Clement and Akman extended Zeeman's model for the heartbeat to describe eye movement control of different species using aspects of catastrophe theory. The scientists created a model that gives an example of how the techniques of catastrophe theory can be used to understand information processing by biological organisms, a key aspect of biological cybernetics. They tested how well the system of equations for Zeeman's model could be applied to saccadic eye movements.

scholarly journals Role of Primate Cerebellar Hemisphere in Voluntary Eye Movement Control Revealed by Lesion Effects

2009 ◽  
Vol 101 (2) ◽  
pp. 934-947 ◽  
Author(s):  
Masafumi Ohki ◽  
Hiromasa Kitazawa ◽  
Takahito Hiramatsu ◽  
Kimitake Kaga ◽  
Taiko Kitamura ◽  
...  
Keyword(s):  
Eye Movements ◽  
Eye Movement ◽  
Smooth Pursuit ◽  
Movement Control ◽  
Cerebellar Hemisphere ◽  
Target Velocity ◽  
Eye Movement Control ◽  
Pursuit Eye Movements ◽  
Catch Up

The anatomical connection between the frontal eye field and the cerebellar hemispheric lobule VII (H-VII) suggests a potential role of the hemisphere in voluntary eye movement control. To reveal the involvement of the hemisphere in smooth pursuit and saccade control, we made a unilateral lesion around H-VII and examined its effects in three Macaca fuscata that were trained to pursue visually a small target. To the step (3°)-ramp (5–20°/s) target motion, the monkeys usually showed an initial pursuit eye movement at a latency of 80–140 ms and a small catch-up saccade at 140–220 ms that was followed by a postsaccadic pursuit eye movement that roughly matched the ramp target velocity. After unilateral cerebellar hemispheric lesioning, the initial pursuit eye movements were impaired, and the velocities of the postsaccadic pursuit eye movements decreased. The onsets of 5° visually guided saccades to the stationary target were delayed, and their amplitudes showed a tendency of increased trial-to-trial variability but never became hypo- or hypermetric. Similar tendencies were observed in the onsets and amplitudes of catch-up saccades. The adaptation of open-loop smooth pursuit velocity, tested by a step increase in target velocity for a brief period, was impaired. These lesion effects were recognized in all directions, particularly in the ipsiversive direction. A recovery was observed at 4 wk postlesion for some of these lesion effects. These results suggest that the cerebellar hemispheric region around lobule VII is involved in the control of smooth pursuit and saccadic eye movements.

scholarly journals The Influence of Irrelevant Visual Distractors on Eye Movement Control in Chinese Children with Autism Spectrum Disorder: Evidence from the Remote Distractor Paradigm

2019 ◽  
Vol 50 (2) ◽  
pp. 500-512
Author(s):  
Li Zhang ◽  
Guoli Yan ◽  
Li Zhou ◽  
Zebo Lan ◽  
Valerie Benson
Keyword(s):  
Eye Movements ◽  
Eye Movement ◽  
Attentional Control ◽  
Movement Control ◽  
Children With Autism ◽  
Autism Spectrum ◽  
Typically Developing ◽  
Typically Developing Children ◽  
Eye Movement Control ◽  
Children With Asd

Abstract The current study examined eye movement control in autistic (ASD) children. Simple targets were presented in isolation, or with central, parafoveal, or peripheral distractors synchronously. Sixteen children with ASD (47–81 months) and nineteen age and IQ matched typically developing children were instructed to look to the target as accurately and quickly as possible. Both groups showed high proportions (40%) of saccadic errors towards parafoveal and peripheral distractors. For correctly executed eye movements to the targets, centrally presented distractors produced the longest latencies (time taken to initiate eye movements), followed by parafoveal and peripheral distractor conditions. Central distractors had a greater effect in the ASD group, indicating evidence for potential atypical voluntary attentional control in ASD children.

scholarly journals Lexical and post-lexical complexity effects on eye movements in reading

2011 ◽  
Vol 4 (1) ◽  
Author(s):  
Tessa Warren ◽  
Erik D. Reichle ◽  
Nikole D. Patson
Keyword(s):  
Eye Movements ◽  
Eye Movement ◽  
Lexical Processing ◽  
Movement Control ◽  
Eye Movement Control ◽  
Lexical Complexity ◽  
Eye Movements During Reading ◽  
Processing Difficulty

The current study investigated how a post-lexical complexity manipulation followed by a lexical complexity manipulation affects eye movements during reading. Both manipulations caused disruption in all measures on the manipulated words, but the patterns of spillover differed. Critically, the effects of the two kinds of manipulations did not interact, and there was no evidence that post-lexical processing difficulty delayed lexical processing on the next word (c.f. Henderson & Ferreira, 1990). This suggests that post-lexical processing of one word and lexical processing of the next can proceed independently and likely in parallel. This finding is consistent with the assumptions of the E-Z Reader model of eye movement control in reading (Reichle, Warren, & McConnell, 2009).

scholarly journals Dopamine and eye movement control in Parkinson’s disease: deficits in corollary discharge signals?

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e6038 ◽  
Author(s):  
Henry Railo ◽  
Henri Olkoniemi ◽  
Enni Eeronheimo ◽  
Oona Pääkkönen ◽  
Juho Joutsa ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Eye Movements ◽  
Eye Movement ◽  
Visual Information ◽  
Early Stage ◽  
Movement Control ◽  
Saccadic Eye Movements ◽  
Corollary Discharge ◽  
Motor Deficits

Movement in Parkinson’s disease (PD) is fragmented, and the patients depend on visual information in their behavior. This suggests that the patients may have deficits in internally monitoring their own movements. Internal monitoring of movements is assumed to rely on corollary discharge signals that enable the brain to predict the sensory consequences of actions. We studied early-stage PD patients (N = 14), and age-matched healthy control participants (N = 14) to examine whether PD patients reveal deficits in updating their sensory representations after eye movements. The participants performed a double-saccade task where, in order to accurately fixate a second target, the participant must correct for the displacement caused by the first saccade. In line with previous reports, the patients had difficulties in fixating the second target when the eye movement was performed without visual guidance. Furthermore, the patients had difficulties in taking into account the error in the first saccade when making a saccade toward the second target, especially when eye movements were made toward the side with dominant motor symptoms. Across PD patients, the impairments in saccadic eye movements correlated with the integrity of the dopaminergic system as measured with [123I]FP-CIT SPECT: Patients with lower striatal (caudate, anterior putamen, and posterior putamen) dopamine transporter binding made larger errors in saccades. This effect was strongest when patients made memory-guided saccades toward the second target. Our results provide tentative evidence that the motor deficits in PD may be partly due to deficits in internal monitoring of movements.

Luminance as a Parameter of the Eye-Movement Control System*

1967 ◽  
Vol 57 (3) ◽  
pp. 394 ◽  
Author(s):  
Leon L. Wheeless ◽  
Gerald H. Cohen ◽  
Robert M. Boynton
Keyword(s):  
Control System ◽  
Eye Movement ◽  
Movement Control ◽  
Eye Movement Control
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