scholarly journals Vision Restoration Therapy (VRT) for the treatment of visual field deficits after brain damage: the role of eye movements and fixation behavior

2004 ◽  
Vol 4 (11) ◽  
pp. 29-29 ◽  
Author(s):  
B. A. Sabel ◽  
S. Kenkel ◽  
E. Kasten ◽  
I. Mueller
Keyword(s):  
Eye Movements ◽  
Visual Field ◽  
Brain Damage ◽  
Visual Field Deficits ◽  
Vision Restoration

Never-medicated and chronic schizophrenics have right visual field deficits in exploratory eye movements

1989 ◽  
Vol 25 (7) ◽  
pp. A78
Author(s):  
S.G. Potkin ◽  
J.M. Swanson ◽  
M. Kharazmi ◽  
M. Urbanchek ◽  
J. Sramek ◽  
...  
Keyword(s):  
Eye Movements ◽  
Visual Field ◽  
Right Visual Field ◽  
Chronic Schizophrenics ◽  
Visual Field Deficits

Strobe Frequency in the Rod and Frame Effect

1997 ◽  
Vol 85 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Corinne Cian ◽  
Dominique Esquivie ◽  
Pierre-Alain Barraud ◽  
Christian Raphel ◽  
Théophile Ohlmann
Keyword(s):  
Eye Movements ◽  
Visual Field ◽  
Body Posture ◽  
Visual Scanning ◽  
Posture Analysis ◽  
Frame Effect ◽  
Field Static ◽  
Normal Light ◽  
Rod And Frame

This experiment dealt with the role of strobe frequency on the rod and frame effect in frame-dependent and frame-independent subjects in light of the destabilizing effect of strobe lighting on body posture. Analysis showed that the frame effect was resistant to strobe illumination and was significantly stronger at 2 Hz titan at 9 Hz. Since the stroboscopic effect was not related to the extent of the frame effect observed in normal light, there was no over-all dependence on the different components of the visual field (static and kinetic). Moreover, analysis of eye movements during stroboscopic exposure confirmed previous observation of a visual scanning style related to orienting activity.

scholarly journals Visual working memory representations in visual and parietal cortex do not remap after eye movements

2019 ◽  
Author(s):  
Tao He ◽  
Matthias Ekman ◽  
Annelinde R.E. Vandenbroucke ◽  
Floris P. de Lange
Keyword(s):  
Working Memory ◽  
Visual Cortex ◽  
Eye Movements ◽  
Visual Field ◽  
Visual System ◽  
Visual Working Memory ◽  
Parietal Cortex ◽  
List Type ◽  
Early Visual Cortex

ABSTRACTIt has been suggested that our visual system does not only process stimuli that are directly available to our eyes, but also has a role in maintaining information in VWM over a period of seconds. It remains unclear however what happens to VWM representations in the visual system when we make saccades. Here, we tested the hypothesis that VWM representations are remapped within the visual system after making saccades. We directly compared the content of VWM for saccade and no-saccade conditions using MVPA of delay-related activity measured with fMRI. We found that when participants did not make a saccade, VWM representations were robustly present in contralateral early visual cortex. When making a saccade, VWM representations degraded in contralateral V1-V3 after the saccade shifted the location of the remembered grating to the opposite visual field. However, contrary to our hypothesis we found no evidence for the representations of the remembered grating at the saccadic target location in the opposite visual field, suggesting that there is no evidence for remapping of VWM in early visual cortex. Interestingly, IPS showed persistent VWM representations in both the saccade and no-saccade condition. Together, our results indicate that VWM representations in early visual cortex are not remapped across eye movements, potentially limiting the role of early visual cortex in VWM storage.HighlightsVisual working memory (VWM) representations do not remap after making saccadesEye movement degrade VWM representations in early visual cortex, limiting the role of early visual cortex in VWM storageParietal cortex shows persistent VWM representations across saccades

scholarly journals The role of awake craniotomy in reducing intraoperative visual field deficits during tumor surgery

2015 ◽  
Vol 10 (3) ◽  
pp. 139 ◽  
Author(s):  
RicardoJ. Komotar ◽  
Racheal Wolfson ◽  
Neil Soni ◽  
AshishH. Shah ◽  
Ananth Sastry ◽  
...  
Keyword(s):  
Visual Field ◽  
Awake Craniotomy ◽  
Tumor Surgery ◽  
Visual Field Deficits

Role of striate cortex and superior colliculus in visual guidance of saccadic eye movements in monkeys

1977 ◽  
Vol 40 (1) ◽  
pp. 74-94 ◽  
Author(s):  
C. W. Mohler ◽  
R. H. Wurtz
Keyword(s):  
Eye Movements ◽  
Visual Field ◽  
Superior Colliculus ◽  
Stimulus Intensity ◽  
Macaca Mulatta ◽  
Striate Cortex ◽  
Visual Stimuli ◽  
Saccadic Eye Movements ◽  
Visual Guidance

1. We studied the effect of lesions placed in striate cortex or superior colliculus on the detection of visual stimuli and the accuracy of saccadic eye movements. The monkeys (Macaca mulatta) first learned to respond to a 0.25 degrees spot of light flashed for 150-200 ms in one part of the visual field while they were fixating in order to determine if they could detect the light. The monkeys also learned in a different task to make a saccade to the spot of light when the fixation point went out, and the accuracy of the saccades was measured. 2. Following a unilateral partial ablation of the striate cortex in two monkeys they could not detect the spot of light in the resulting scotoma or saccade to it. The deficit was only relative; if we increased the brightness of the stimulus from the usual 11 cd/m2 to 1,700 cd/m2 against a background of 1 cd/m2 the monkeys were able to detect and to make a saccade to the spot of light. 3. Following about 1 mo of practice on the detection and saccade tasks, the monkeys recovered the ability to detect the spots of light and to make saccades to them without gross errors (saccades made beyond an area of +/-3 average standard deviations). Lowering the stimulus intensity reinstated both the detection and saccadic errors...

scholarly journals Optic nerve compression in craniopharyngioma by taut anterior cerebral arteries visualized in frontal and transsphenoidal exposures: illustrative cases

2022 ◽  
Vol 3 (3) ◽  
Keyword(s):  
Optic Nerve ◽  
Visual Field ◽  
Pediatric Patients ◽  
Anterior Cerebral Artery ◽  
Cerebral Arteries ◽  
Initial Exposure ◽  
Visual Deficits ◽  
Visual Field Deficits ◽  
Optic Nerve Compression

BACKGROUND During initial exposure and removal of craniopharyngioma in pediatric patients with severe visual field deficits, the authors have encountered severe deformation of the optic apparatus by taut anterior cerebral arteries as seen during both frontal craniotomy and transsphenoidal exposures. OBSERVATIONS The authors report two pediatric patients with craniopharyngioma whose severe preoperative visual deficits were associated not only with large suprasellar masses but also with severe optic nerve and chiasm compression by taut anterior cerebral arteries. In each patient, the optic nerves were partially cleft by these vessels’ indenting them. LESSONS The role of a taut anterior cerebral artery complex in compression of the optic apparatus in patients with suprasellar tumors has been reported previously, but the intraoperative images in these two cases dramatically reveal this phenomenon.

Sign in / Sign up

Export Citation Format

Share Document