What is photic stimulation in EEG?

What is photic stimulation in EEG?

Abstract. Intermittent photic stimulation (IPS) is a common procedure performed in the electroencephalography (EEG) laboratory in children and adults to detect abnormal epileptogenic sensitivity to flickering light (i.e., photosensitivity).

What is photo paroxysmal?

Photoparoxysmal response 1 The photoparoxysmal response (PPR), also referred to as photosensitivity, is defined as the abnormal occurrence of cortical spikes or spike and wave discharges on electroencephalogram (EEG) in response to intermittent light stimulation (Doose and Waltz, 1993).

What is Photoconvulsive response?

Photoconvulsive responses (PCRs) were characterised by either a bilateral upper extremity myoclonus lasting throughout the stimulus associated with activation of the motor cortices (Type 1) or a brief generalised myoclonic seizure related to a frontally- predominant generalised ictal discharge extensively involving the …

What type of epilepsy syndrome is linked to photosensitivity?

This condition is known as photosensitive epilepsy. Photosensitive epilepsy is more common in children and adolescents, especially those with generalized epilepsy and with certain epilepsy syndromes, such as juvenile myoclonic epilepsy and epilepsy with eyelid myoclonia (Jeavon’s syndrome).

What is a normal response to photic stimulation?

In response to photic stimulation (p. 40), it is usual to observe the so-called driving response over the posterior regions of the head. This response consists of rhythmic activity that is time-locked to the stimulus and has a frequency identical or harmonically related to that of the flickering light.

Is all epilepsy photosensitive?

Photosensitive epilepsy is not common but it may be diagnosed when you have an EEG test. Flashing or patterned effects can make people with or without epilepsy feel disorientated, uncomfortable or unwell. This does not necessarily mean they have photosensitive epilepsy.

What is idiopathic generalized epilepsy?

Idiopathic generalized epilepsy (IGE) is a group of epileptic disorders that are believed to have a strong underlying genetic basis. Patients with an IGE subtype are typically otherwise normal and have no structural brain abnormalities.

Is photic driving response normal?

Rationale: Photic driving is a physiologic response (PDR) consisting of rhythmic activity elicited over the parietooccipital regions. It is time locked to the flash frequency during photic stimulation. It can be evoked a few hours after birth. The amplitude of PDR is usually tends to increase in elderly people.

What does photosensitive epilepsy feel like?

People with photosensitive epilepsy have seizures that are triggered by: Flashing lights. Bold, contrasting visual patterns (such as stripes or checks)

Do photosensitive seizures happen immediately?

Images flash very quickly and generally this is too quickly to trigger a seizure in people with photosensitive epilepsy. However, the field of view is large and so more of the eye is stimulated. This means that more of the brain may be affected and this may trigger a seizure.

What is an abnormal EEG mean?

An abnormal EEG means that there is a problem in an area of brain activity. This can offer a clue in diagnosing various neurological conditions.

Will seizures show up on MRI?

MRI (magnetic resonance imaging) is the diagnostic tool that identifies structural changes in the brain that may cause seizures or be associated with epilepsy.

What is a Jacksonian seizure?

Overview. A Jacksonian seizure is a type of focal partial seizure, also known as a simple partial seizure. This means the seizure is caused by unusual electrical activity that affects only a small area of the brain. The person maintains awareness during the seizure.

What does photic driving mean?

Can too much screen time trigger seizures?

Too much texting and exposure to computer screens – electronic stress – can set off an epileptic attack. Factors like emotional stress, skipping meals, sleep deprivation, fatigue, smoking, alcohol consumption, etc. can also trigger seizures in persons with epilepsy.

What does photosensitive seizure feel like?

Photosensitive epilepsy is when seizures are triggered by flashing lights or contrasting light and dark patterns. Photosensitive epilepsy is not common but it may be diagnosed when you have an EEG test. Flashing or patterned effects can make people with or without epilepsy feel disorientated, uncomfortable or unwell.