Response times per (left and right) eye per visual hemifield
Scheme of the visual field when tested binocularly. Right hemifield is
The locations of nine hemifield maps in the human visual cortex. The
Retinal Hemifield Slide Phenomenon
COMMENTS
Retinal Hemifield Slide Phenomenon
The retinal hemifield slide phenomenon occurs when heteronymous hemianopic defects result in visual fields that can not be easily fused and therefore disassociate from one another, causing a nonparetic diplopia. Physiologically, nasal and temporal visual fields overlap between the right and left eyes and allows corresponding retinal points to ...
Study Guide: Visual field defects
Explore a comprehensive study guide on visual field defects, their identification, and impact on vision.
Hemifield-specific control of spatial attention and working memory
Unclear, however, is whether hemifield-specific processing in healthy individuals is restricted to early stages of visual processing, or instead extends to higher level processes such as attention and working memory.
Ophthalmic Presentations of Pituitary Adenoma
Ophthalmic Presentations of Pituitary Adenoma The ocular examination can aid diagnosis and help guide treatment.
When Side Matters: Hemispheric Processing and the Visual Specificity of
Nevertheless, this is one of the few studies to show such an effect of hemispheric processing on episodic encoding for objects (but see Berrini et al., 1982; Evans & Federmeier, 2007; Federmeier & Benjamin, 2005; Hannay & Malone, 1976 for evidence that hemifield presentation can influence subsequent episodic memory for words), and the first to ...
Standard Automated Perimetry
Visual function assessment is integral to the evaluation and management of glaucoma. Visual field testing can be performed by various methods, including confrontation technique, Amsler grid, tangent screen, kinetic perimetry, or static perimetry. This review will focus primarily on standard automated perimetry (SAP).
Hemifield Slide Phenomenon as a Result of Heteronymous Hemianopia
Introduction. Hemifield slide describes the phenomenon of inability to stabilise and fuse visual hemifields in the setting of heteronymous visual field loss. 1, 2 This presumably results from loss of corresponding retinal points in the two eyes, allowing an underlying phoria to manifest as a tropia, or instability of ocular alignment. 1, 2 For ...
Prefrontal cortex and basal ganglia contributions to visual ...
By making use of a lateralized VWM design with a scalp EEG, we were able to take advantage of the anatomical separation of visual inputs into the neocortex by visual hemifield of presentation and examine the effects of lesions on top-down VWM maintenance.
The relative capabilities of the upper and lower visual hemifields
Visual performance is better in the lower visual hemifield than in the upper field for many classes of stimuli. The origin of this difference is unclear. One theory associates it with finer-grained attention in the lower field, an idea consistent with a change in relative efficacy with task difficulty. The first experiment in this study ...
Impact of lower- vs. upper-hemifield presentation on automatic colour
We determined the influence of lower- vs. upper-hemifield presentation of the irregular stimulus on the vMMN while using whole-field stimulus displays controlling for sustained shifts in spatial attention. Deviances presented in the lower hemifield elicited a larger vMMN than the ones presented in the upper hemifield at a latency of 200-280ms.
Breaking Down Visual Fields in Glaucoma
Automated perimetry is a critical tool in the diagnosis and follow-up care of glaucoma patients. While advancements in imaging technology (OCT) have improved our ability to evaluate structural damage, perimetry remains the primary method to evaluate visual function in glaucoma. Ultimately, the primary goal of glaucoma therapy is to maintain the patient's visual function throughout their ...
Compressive Visual Field Defects
Mass effect is the compression of nearby structures by a mass (aneurysm, tumor, hematoma, abscess). When affecting the visual pathway, mass effect can cause a multitude of changes in a patient's visual field. Specific visual field deficits can be attributed to the location of compression, which in turn can help clinicians localize lesions ...
Divided visual field paradigm
The Divided Visual Field Paradigm is an experimental technique that involves measuring task performance when visual stimuli are presented on the left or right visual hemifields. If a visual stimulus appears in the left visual field (LVF), the visual information is initially projected to the right cerebral hemisphere (RH), and conversely, if a ...
PDF doi:10.1016/j.brainres.2007.03.008
Further, hemifield priming studies using sentential stimuli have revealed priming for both literal and metaphorical meanings with presentation to both visual fields (Kacinik and Chiarello, 2007), and even shown more pronounced metaphor priming with presentation to the RVF (Faust and Weisper, 2000).
EEG evidence of face-specific visual self-representation
As for the effect of visual hemifield presentation, interaction with stimulus familiarity was not observed. In conclusion, EEG evidence from the present study supports the explanation that visual self-representation is domain-dependent.
Distribution and Rates of Visual Field Loss across Different Disease
Hemifield Asymmetry in the Degree of Visual Field Loss Our results show that for POAG eyes in the early and moderate stages of glaucoma, the hemifield asymmetry (superior worse than the inferior) was significant in the GHT central and peripheral arcuate 2 regions.
Moran CORE
Diagnosis: Hemifield slide, bi-temporal hemianopsia. Brief Description: This is a case presentation of a middle-aged male who presented with visual field defects, vision disturbances, and diplopia after a traumatic brain injury. The patient's 6th nerve palsy, chiasmal injury, and hemifield slide are discussed, with special attention to the ...
Within-Hemifield Competition in Early Visual Areas Limits the Ability
It is much easier to divide attention across the left and right visual hemifields than within the same visual hemifield. Here we investigate whether this benefit of dividing attention across separate visual fields is evident at early cortical processing stages. We measured the steady-state visual evoked potential, an oscillatory response of the visual cortex elicited by flickering stimuli, of ...
Visual mismatch negativity (vMMN) is elicited with para-foveal
The vMMN is elicited with visual hemifield presentation which demonstrates that the sensory processes generating the vMMN can operate over a comparable small spatial area in the visual field.
Testing hemifield independence for divided attention in visual object
In contrast, for an object identity task such as object change detection, a visual working memory account is insufficient: Cohen et al. (2016) report that hemifield effects present in a simultaneous presentation display are eliminated in a sequential presentation display.
PDF Right Hemisphere Sensitivity to Word- and Sentence-Level Context
Embedded in sentences, these same pairs showed large sentential context effects in both fields. Small effects of association were observed, confined to incongruous sentences after right visual hemifield presentation but present for both congruous and incongruous sentences after left visual hemifield presentation.
(PDF) Impact of lower- vs. upper-hemifield presentation on automatic
Impact of lower- vs. upper-hemifield presentation on automatic colour-deviance detection: A visual mismatch negativity study
Brain Representation of Hemifield Stimulation in Poststroke Visual
Results— In normal subjects, significant activation was found in the contralateral primary visual cortex and bilaterally in the extrastriate cortex. During hemifield stimulation of the unaffected side of stroke patients, a similar pattern was found compared with that seen in control subjects.
This AI Graphics Startup Is a Cheap, Easy Alternative to Adobe ...
Adding pizazz to presentations In my testing of Napkin, I had it create graphics to improve presentation slides, break down a complicated topic for an article and brainstorm different visual ideas.
IMAGES
COMMENTS
The retinal hemifield slide phenomenon occurs when heteronymous hemianopic defects result in visual fields that can not be easily fused and therefore disassociate from one another, causing a nonparetic diplopia. Physiologically, nasal and temporal visual fields overlap between the right and left eyes and allows corresponding retinal points to ...
Explore a comprehensive study guide on visual field defects, their identification, and impact on vision.
Unclear, however, is whether hemifield-specific processing in healthy individuals is restricted to early stages of visual processing, or instead extends to higher level processes such as attention and working memory.
Ophthalmic Presentations of Pituitary Adenoma The ocular examination can aid diagnosis and help guide treatment.
Nevertheless, this is one of the few studies to show such an effect of hemispheric processing on episodic encoding for objects (but see Berrini et al., 1982; Evans & Federmeier, 2007; Federmeier & Benjamin, 2005; Hannay & Malone, 1976 for evidence that hemifield presentation can influence subsequent episodic memory for words), and the first to ...
Visual function assessment is integral to the evaluation and management of glaucoma. Visual field testing can be performed by various methods, including confrontation technique, Amsler grid, tangent screen, kinetic perimetry, or static perimetry. This review will focus primarily on standard automated perimetry (SAP).
Introduction. Hemifield slide describes the phenomenon of inability to stabilise and fuse visual hemifields in the setting of heteronymous visual field loss. 1, 2 This presumably results from loss of corresponding retinal points in the two eyes, allowing an underlying phoria to manifest as a tropia, or instability of ocular alignment. 1, 2 For ...
By making use of a lateralized VWM design with a scalp EEG, we were able to take advantage of the anatomical separation of visual inputs into the neocortex by visual hemifield of presentation and examine the effects of lesions on top-down VWM maintenance.
Visual performance is better in the lower visual hemifield than in the upper field for many classes of stimuli. The origin of this difference is unclear. One theory associates it with finer-grained attention in the lower field, an idea consistent with a change in relative efficacy with task difficulty. The first experiment in this study ...
We determined the influence of lower- vs. upper-hemifield presentation of the irregular stimulus on the vMMN while using whole-field stimulus displays controlling for sustained shifts in spatial attention. Deviances presented in the lower hemifield elicited a larger vMMN than the ones presented in the upper hemifield at a latency of 200-280ms.
Automated perimetry is a critical tool in the diagnosis and follow-up care of glaucoma patients. While advancements in imaging technology (OCT) have improved our ability to evaluate structural damage, perimetry remains the primary method to evaluate visual function in glaucoma. Ultimately, the primary goal of glaucoma therapy is to maintain the patient's visual function throughout their ...
Mass effect is the compression of nearby structures by a mass (aneurysm, tumor, hematoma, abscess). When affecting the visual pathway, mass effect can cause a multitude of changes in a patient's visual field. Specific visual field deficits can be attributed to the location of compression, which in turn can help clinicians localize lesions ...
The Divided Visual Field Paradigm is an experimental technique that involves measuring task performance when visual stimuli are presented on the left or right visual hemifields. If a visual stimulus appears in the left visual field (LVF), the visual information is initially projected to the right cerebral hemisphere (RH), and conversely, if a ...
Further, hemifield priming studies using sentential stimuli have revealed priming for both literal and metaphorical meanings with presentation to both visual fields (Kacinik and Chiarello, 2007), and even shown more pronounced metaphor priming with presentation to the RVF (Faust and Weisper, 2000).
As for the effect of visual hemifield presentation, interaction with stimulus familiarity was not observed. In conclusion, EEG evidence from the present study supports the explanation that visual self-representation is domain-dependent.
Hemifield Asymmetry in the Degree of Visual Field Loss Our results show that for POAG eyes in the early and moderate stages of glaucoma, the hemifield asymmetry (superior worse than the inferior) was significant in the GHT central and peripheral arcuate 2 regions.
Diagnosis: Hemifield slide, bi-temporal hemianopsia. Brief Description: This is a case presentation of a middle-aged male who presented with visual field defects, vision disturbances, and diplopia after a traumatic brain injury. The patient's 6th nerve palsy, chiasmal injury, and hemifield slide are discussed, with special attention to the ...
It is much easier to divide attention across the left and right visual hemifields than within the same visual hemifield. Here we investigate whether this benefit of dividing attention across separate visual fields is evident at early cortical processing stages. We measured the steady-state visual evoked potential, an oscillatory response of the visual cortex elicited by flickering stimuli, of ...
The vMMN is elicited with visual hemifield presentation which demonstrates that the sensory processes generating the vMMN can operate over a comparable small spatial area in the visual field.
In contrast, for an object identity task such as object change detection, a visual working memory account is insufficient: Cohen et al. (2016) report that hemifield effects present in a simultaneous presentation display are eliminated in a sequential presentation display.
Embedded in sentences, these same pairs showed large sentential context effects in both fields. Small effects of association were observed, confined to incongruous sentences after right visual hemifield presentation but present for both congruous and incongruous sentences after left visual hemifield presentation.
Impact of lower- vs. upper-hemifield presentation on automatic colour-deviance detection: A visual mismatch negativity study
Results— In normal subjects, significant activation was found in the contralateral primary visual cortex and bilaterally in the extrastriate cortex. During hemifield stimulation of the unaffected side of stroke patients, a similar pattern was found compared with that seen in control subjects.
Adding pizazz to presentations In my testing of Napkin, I had it create graphics to improve presentation slides, break down a complicated topic for an article and brainstorm different visual ideas.