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: It is advocated that research on dyslexia is directed at possible deficits in reading processes such as eye control, word recognition, and storage not only as separate factors but rather in their intimate relationships.
156 citations
TL;DR: An examination of infant neuroanatomical data suggests that three major factors are involved in the development of these mechanisms, which are developed into a quantitative model which is shown to provide a coherent interpretation of many of the psychophysical data on infant vision.
155 citations
TL;DR: It is proposed that the displacement of cells from the inner layers is related to the earlier developmental accumulation of photoreceptors and inner retinal cells centrally and leads to metabolic "starvation" of the inner retina, resulting from the complete absence of retinal vessels from the vicinity of the incipient fovea.
154 citations
TL;DR: It is shown that most peripheral PC cells have red–green modulation sensitivity close to that of foveal PC cells, incompatible with the view that PC pathway cells in peripheral retina make indiscriminate connections with retinal circuits devoted to different spectral types of cone photoreceptors.
Abstract: Visual abilities change over the visual field. For example, our ability to detect movement is better in peripheral vision than in foveal vision, but colour discrimination is markedly worse. The deterioration of colour vision has been attributed to reduced colour specificity in cells of the midget, parvocellular (PC) visual pathway in the peripheral retina. We have measured the colour specificity (red-green chromatic modulation sensitivity) of PC cells at eccentricities between 20 and 50 degrees in the macaque retina. Here we show that most peripheral PC cells have red-green modulation sensitivity close to that of foveal PC cells. This result is incompatible with the view that PC pathway cells in peripheral retina make indiscriminate connections ('random wiring') with retinal circuits devoted to different spectral types of cone photoreceptors. We show that selective cone connections can be maintained by dendritic field anisotropy, consistent with the morphology of PC cell dendritic fields in peripheral retina. Our results also imply that postretinal mechanisms contribute to the psychophysically demonstrated deterioration of colour discrimination in the peripheral visual field.
152 citations
152 citations