Motor Manifestations in Epileptic Photosensitivity: Clinical Features and Pathophysiological Insights

Guido Rubboli *, Elena Gardella, Stefano Meletti

*Kontaktforfatter for dette arbejde

Publikation: Kapitel i bog/rapport/konference-proceedingKapitel i bogForskningpeer review

Abstrakt

A wide spectrum of motor phenomena are associated with epileptic photosensitivity. In this chapter, we will give an overview of the most common clinical manifestations of epileptic photosensitivity focusing in particular on visually induced epileptic motor phenomena such as eyelid myoclonia with absences (EMA) and photic reflex myoclonus (PRM), providing some insights into their pathophysiological mechanisms.

In EMA, current evidences by multimodal imaging and neurophysiological techniques support the hypothesis of an intrinsic “visuo-motor hyperexcitability.” The demonstration that this upregulation is detectable under resting (unstimulated) conditions and even during the alpha rhythm, the hallmark of the brain resting state, indicates a probable genetic predisposition to generate synchronous paroxysmal activity.

In PRM, neurophysiological investigations suggest that this myoclonic phenomenon requires the participation of both occipital and motor cortices. The excitatory activity elicited by the visual stimulus in the occipital cortex spread to the central motor cortex, generating a myoclonic volley that propagates down the spinal cord via fast-conducting corticospinal pathways.
OriginalsprogEngelsk
TitelThe Importance of Photosensitivity for Epilepsy
RedaktørerDorothee Kasteleijn-Nolst Trenite
ForlagSpringer
Publikationsdato2021
Sider185-197
ISBN (Trykt)978-3-319-05079-9
ISBN (Elektronisk)978-3-319-05080-5
DOI
StatusUdgivet - 2021

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