Topic
Foveal
About: Foveal is a research topic. Over the lifetime, 2652 publications have been published within this topic receiving 94120 citations.
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TL;DR: The results showed that the observers could not shift attention away from fixation to an extrafoveal position as efficiently as they could maintain attention at fixation.
25 citations
01 Apr 1927
TL;DR: Cemocebus ficliginosus possesses the purest cone retina and the most perfect foveal excavation, which is likely to be the case in the diurnal retina.
Abstract: Summary.
1
The Lemuroidea examined are characterised by a retina of the nocturnal type.
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flyctipithecus, n true Monkey, has a retina of the nocturnal type without macula or fovea.
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The genern1is:ttion that a macula and fovea are found only in the retina when cones are present is confirmed.
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An additional distinction between the diurnal and nocturnal retina is present in the size of the nuclear layers. The outer nuclear layer is the larger in the nocturnal: the inner is the larger in the diurnal. Put another way there are more percipient elements than conducting elements in the nocturnal; the reverse is the case in the diurnal retina.
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An attempt has been made to arrange the Simiae examined in the order of retinal differentiation. Cemocebus ficliginosus possesses the purest cone retina and the most perfect foveal excavation. The differences are too slight and the layers too individually variable to attach much validity to the above tables.
24 citations
TL;DR: The effects of stimulus-response (S-R) spatial compatibility on reaction time (RT) and P300 component latency were studied, in order to determine whether spatial conflict effects can occur within a single cerebral hemisphere, and whether there are differences between hemispheres regarding such effects.
Abstract: The effects of stimulus-response (S-R) spatial compatibility on reaction time (RT) and P300 component latency were studied, in order to determine whether spatial conflict effects can occur within a single cerebral hemisphere, and whether there are differences between hemispheres regarding such effects. Two choice RT experimental conditions were employed: I) an extrafoveal condition, in which stimuli (small arrows pointing either to the right or to the left) appeared laterally in one visual hemifield, the responses being given with the hand situated on the same side; likewise with the opposite hemifield and hand (cond. I); and II) a foveal condition, in which the same type of stimuli appeared centrally on the fovea, the response being given successively with both hands (cond. II). In either case, the color of the stimuli (cue information) determined which finger (forefinger or ring finger) of the same hand would deliver the response. Thus, the cue was either compatible, or not, with the stimulus orientation (arrows). In each condition, the four possible stimulus combinations, according to direction and color of the arrows, were presented at random.
Results showed that: 1) in the extrafoveal condition, S-R compatibility effects were observed in each single hemisphere, and were reflected both by RT and by P300 latency; 2) both hemispheres reacted in the same way to the spatial conflict; and 3) foveal vision increased the overall effect of the conflict on both P300 latency and RT.
24 citations
TL;DR: A similar distance dependence is reported for orientation signal integration across stimulus differences in binocular disparity, direction of motion, and direction of figure-ground assignment and it is demonstrated that the selectivity found at short separations cannot be explained only by "end-cuts," the small borders created at the junction of abutting contrasting patterns.
Abstract: Human observers can discriminate the orientation of a stimulus configuration composed of a pair of collinear visual patterns much better than that of a single component pattern alone. Previous inve...
24 citations
TL;DR: Besides traction retinal detachment, vision loss in IP can occur with abnormalities of the inner foveal structure seen on spectral-domain optical coherence tomography, consistent with prior descriptions of fveal hypoplasia.
Abstract: Importance This report presents evidence from spectral-domain optical coherence tomography and fluorescein angiography of inner foveal structural abnormalities associated with vision loss in incontinentia pigmenti (IP). Observations Two children had reduced visual behavior in association with abnormalities of the inner foveal layers on spectral-domain optical coherence tomography. Fluorescein angiography showed filling defects in retinal and choroidal circulations and irregularities of the foveal avascular zones. The foveal to parafoveal ratios were greater than 0.57 in 6 eyes of 3 patients who had extraretinal neovascularization and/or peripheral avascular retina on fluorescein angiography and were treated with laser. Of these, 3 eyes of 2 patients had irregularities in foveal avascular zones and poor vision. Conclusions and Relevance Besides traction retinal detachment, vision loss in IP can occur with abnormalities of the inner foveal structure seen on spectral-domain optical coherence tomography, consistent with prior descriptions of foveal hypoplasia. The evolution of abnormalities in the neural and vascular retina suggests a vascular cause of the foveal structural changes. More study is needed to determine any potential benefit of the foveal to parafoveal ratio in children with IP. Even with marked foveal structural abnormalities, vision can be preserved in some patients with IP with vigilant surveillance in the early years of life.
24 citations