Memory & Cognition

Beyond the seizure

Epilepsy can affect more than seizures. For some people, memory, attention, concentration, processing speed or word-finding can also become part of daily life.

Key point: cognitive difficulties in epilepsy are often multifactorial. They may relate to the epilepsy itself, the underlying brain condition, seizure activity, antiseizure medication, mood, sleep, fatigue, or more than one of these at the same time.

What does “cognition” mean?

Cognition is an umbrella term for mental processes such as attention, memory, language, planning, decision-making and the speed at which information is processed. NICE specifically recognises concerns about memory, attention, concentration, education and workplace performance as important issues to discuss in epilepsy care.

Memory is not one single system

Research increasingly treats memory as several interacting systems rather than one ability. Working memory holds information briefly while it is being used. Episodic memory helps us remember events and experiences. Semantic memory stores facts and knowledge. Different forms of epilepsy can affect these systems differently, and standard memory tests do not always capture the difficulties a person notices in everyday life.

Why can epilepsy affect memory and thinking?

Brain networks and the underlying cause. Memory depends on distributed networks across the brain. Temporal and mesial temporal structures are especially important, but they are not the only areas involved.
Seizures and epileptic activity. Seizure activity can temporarily disrupt attention, memory and language, and some people experience cognitive effects around or between seizures.
Antiseizure medication. Some medicines can affect concentration, processing speed or memory in some people. Effects vary by medicine, dose and individual susceptibility.
Mood and stress. Anxiety and depression can affect concentration and how people experience their own memory. This does not mean memory complaints are imaginary; it means several factors can interact.
Sleep and fatigue. Poor sleep and exhaustion can impair attention and memory even without epilepsy, and may add to cognitive difficulties in someone who already has a seizure disorder.

Why can someone pass a memory test but still struggle?

Clinic tests usually measure memory over a short, controlled period. Daily life is much messier. Some people report problems that do not show clearly on standard testing, including difficulty retaining information over longer periods or remembering events from the more distant past. Research has described patterns such as accelerated long-term forgetting in some forms of epilepsy, where information can appear to be learned normally at first but is lost unusually quickly over days or weeks.

Word-finding, attention and “brain fog”

Cognitive difficulty is not always experienced as “poor memory”. A person may lose track of a conversation, struggle to retrieve a familiar word, need longer to process instructions, or find it difficult to switch between tasks. These experiences can affect confidence, education, employment and social interaction even when seizures are not visible at that moment.

When should changes be discussed with a clinician?

New, rapidly worsening or clearly different memory or cognitive problems deserve medical attention, especially if they appear alongside a change in seizure pattern, medication, behaviour, speech or neurological function. NICE also recommends considering cognitive or memory decline in parts of the diagnostic work-up for selected people with epilepsy of unknown cause.

Medication should not be reduced or stopped without specialist advice. If a medicine is suspected of contributing to cognitive side effects, that is a reason to discuss the problem with the treating team rather than change treatment independently.

Practical ways to reduce the load

write important information down rather than relying on memory alone
use calendars, reminders and consistent places for essential items
break complicated information into shorter steps
allow extra processing time after seizures or during periods of fatigue
record patterns alongside seizures, sleep and medication changes

These strategies do not treat the cause of a cognitive problem, but they can reduce day-to-day pressure while the underlying factors are being assessed.

Sources

Medical note: This page is for education and awareness. It does not diagnose the cause of an individual person’s memory or cognitive symptoms.