Functional amblyopia and clinical electrophysiology by means of multimodal visual evoked dynamic topography.

The visual evoked response in hysterical amblyopia.

Hysterical amblyopia is a term used to describe a syndrome in which reduction of visual acuity accompanied by contraction of the visual fields occurs in the absence of any organic lesion. This syndrome has been the subject of many reports (Eames, I 947; Yasuna, 1951; Schlaegel and Quilala, 1955; Krill, I967), but no conclusive diagnostic test has yet been established. Spiralling of the visual f...

Multifocal visual evoked potentials in amblyopia due to anisometropia

PURPOSE To investigate multifocal visual evoked potentials (mfVEP) of the amblyopic and fellow eye in amblyopia due to anisometropia. METHODS We recorded mfVEP in both eyes of 15 anisometropic amblyopic patients and 15 normal control subjects. The responses from the central 7.0 degrees arc of the visual field were measured, and changes in latency and amplitude were compared between the amblyo...

simultaneous pattern visual evoked potential and pattern electroretinogram in strabismic and anisometropic amblyopia

The Cortical Topography of Visual Evoked Potentials Elicited by Chromatic and Luminance Motion

When motion-onset VEPs are elicited by moving luminance patterns, the motion specific component of the response, N2, is more prominent at electrode sites that overlay the lateral occipito-parietal cortex close to area V5/MT, than over the primary visual cortex. Functional segregation suggests that colour and motion processing should take place along different ventral occipito-temporal and later...

Dynamic brain sources of visual evoked responses.

It has been long debated whether averaged electrical responses recorded from the scalp result from stimulus-evoked brain events or stimulus-induced changes in ongoing brain dynamics. In a human visual selective attention task, we show that nontarget event-related potentials were mainly generated by partial stimulus-induced phase resetting of multiple electroencephalographic processes. Independe...