Spatial updating and the maintenance of visual constancy


19-Jul-2017 10:31

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Understanding the exact mechanisms of oscillopsia may lead to novel treatment.

Neurons in the lateral intraparietal area, frontal eye field, and superior colliculus exhibit a pattern of activity known as remapping.

„Viele neurologische Erkrankungen können wir damit heute am Auge ablesen.“ Die in den letzten Jahren methodisch enorm verbesserte optische Kohärenztomographie (OCT) ist wesentlich aussagekräftiger als eine konventionelle Ophthalmoskopie: Man kann alle zehn Retinaschichten in mikroskopischer Auflösung darstellen und in wenigen Sekunden abscannen (1).

Die gemessenen Veränderungen korrelieren erstaunlich gut mit degenerativen Hirnveränderungen bei chronischen neurologischen Erkrankungen: z. die Dicke der retinalen Faserschicht (RNFL) mit dem Hirnvolumen, die Dicke der inneren Körnerschicht (INL) mit dem Volumen aller in der Kernspintomographie (MRT) dargestellten T2-hyperintensen Entzündungsherde und die Dicke der äußeren Körnerschicht (ONL) mit der fortschreitenden Neurodegeneration bei Multipler Sklerose (MS).

The goal of this study is to review the recent findings in the various pathophysiological mechanisms of oscillopsia and the potential treatments available.

Recent findings: Oscillopsia most often results from abnormal eye movements or from impaired vestibulo-ocular reflex.

In 16% of V3A neurons, remapped activity began even before saccade onset.

Remapping also was observed at earlier stages of the visual hierarchy, including in areas V3 and V2.

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The mechanism which accomplishes this 'systematic overlooking' is the information-processing system of the organism, and the principle according to which it is accomplished is that this system never expands more of its capacity on a given perceptual task than is necessary according to the current needs and interests of the agent.

More than half (52%) of V3A neurons responded to a stimulus flashed in the new RF even though the stimulus had already disappeared before the saccade.