Quiz Form

Question Date: 03/12/2023

Question: What is the EEG phenomenon shown below?

Options:

• 3 Hz spike and wave pattern
• Photo-paroxysmal response
• Photic drive response
• Photo-myoclonic response

Correct Answer: Photo-paroxysmal response

View Image: Image_20231107120012654a26ccc49d1.png

Explaination: The Photic drive response is time locked potentials recorded at the occipital leads same in frequency to the rate of PS and is occipital derivation of the P100 response evoked by visual stimulation (as in Visual evoked potentials)<br>PS works by reinforcing the thalamocortical networks thereby stimulating epileptiform activities termed Photoparoxysmal response (PPR) seen particularly in idiopathic generalised epilepsies<br>PPR consists of spike or polyspike and wave discharges occurring in occipital leads at times generalised and may outlast the photic stimulation and evolve in to clinical seizure (photo-convulsive response).

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