Two Visual Mechanisms of Photosensitivity
نویسندگان
چکیده
منابع مشابه
New Methods for Quantification of Visual Photosensitivity Threshold and Symptoms
PURPOSE Visual photosensitivity is a common symptom difficult to measure and diagnose, and is found in many ocular and neurological disorders. We developed two novel reproducible quantitative assessments of visual photosensitivity. METHODS We designed and built the ocular photosensitivity analyzer (OPA), an automated instrument to determine light intensity visual photosensitivity threshold (V...
متن کاملNon-provocative diagnostics of photosensitivity using visual evoked potentials.
OBJECTIVE Photosensitive epilepsy (PSE) is the most common form of reflex epilepsy. Usually, to find out whether a patient is sensitive, he/she is stimulated visually with, e.g. a stroboscopic light stimulus at variable frequency and intensity until a photo paroxysmal response (PPR) occurs. The research described in this work aims to find whether photosensitivity can be detected without provoki...
متن کاملIs colour modulation an independent factor in human visual photosensitivity?
Considering that the role of colour in photosensitive epilepsy (PSE) remains unclear, we designed a study to determine the potential of different colours, colour combinations and white light to trigger photoparoxysmal responses (PPRs) under stringent controlled conditions. After assessing their photosensitivity to stroboscopic white light and black and white patterns, we studied 43 consecutive ...
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We investigate theoretically the effect of spatial attention on the contrast-response function (CRF) and orientation-tuning curves in early visual areas. We look at a model of a hypercolumn developed recently (Persi et al., 2008), that accounts for both the contrast response and tuning properties in the primary visual cortex, and extend it to two visual areas. The effect of spatial attention is...
متن کاملPhysiology of human photosensitivity.
Human epileptic photosensitivity has been studied in several ways. (a) Visual stimulation that resembles the stimulation normally responsible for seizures, such as that from televisions or videogames, both of which typically use cathode ray tubes in which the display is created in a flickering pattern. Such stimulation is often rendered yet more epileptogenic by programmes with content that als...
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ژورنال
عنوان ژورنال: Epilepsia
سال: 1999
ISSN: 0013-9580,1528-1167
DOI: 10.1111/j.1528-1157.1999.tb02018.x