The same event can mean different things
A pause, language interruption, movement, or change in response must be interpreted against the person’s usual pattern and dementia type.
Compare recognition challenges →Seagull Health dementia-seizure atlas
Understand how seizures can appear across different types of dementia.
A brief change in awareness, movement, responsiveness, or behavior can be difficult to interpret in someone living with dementia. The Subtype Atlas brings together published research across five dementia types, showing how seizures may present, what can be mistaken for them, how detection differs, and what remains uncertain.
Start with a known dementia type, or compare all five.
Start with the dementia type
Choose a dementia type.
Each guide explains how seizures may appear, what can look similar, what EEG studies have found, where the evidence is limited, and what questions remain.
Alzheimer's disease
Alzheimer's disease is a brain disease and the most common cause of dementia. It usually begins with problems in memory and thinking, then gradually affects communication and everyday tasks. Seizures or brief seizure-related discharges without obvious outward signs can blend into those ongoing changes and be difficult to recognize.
Dementia with Lewy bodies
Lewy body disease often causes changing attention, visual hallucinations, dream enactment, fainting, and parkinsonian movement. Those features can resemble or hide seizure events, while direct research on electrical activity without obvious signs remains early.
Frontotemporal dementia
This group of dementias first affects behavior, language, or both, sometimes alongside movement disorders. Epilepsy can appear before or after diagnosis, and a sudden interruption may be mistaken for the person's usual language or behavior difficulty.
Vascular dementia
This dementia results from strokes or other blood-vessel-related brain injury. Seizure risk and presentation depend on the type, location, and timing of that injury, while a new stroke-like change requires urgent assessment.
Mixed dementia
More than one disease process contributes, commonly Alzheimer's disease with vascular injury or Lewy body disease. There is no single mixed-dementia seizure profile: recognition and evidence depend on the actual combination.
Not sure which guide to read? Start with the comparison. If more than one disease process contributes, the mixed dementia guide explains why the combination matters.
Why this matters
Why the dementia type matters.
Dementia types create different recognition challenges, have not been studied equally, and can change how a finding should be interpreted.
The evidence is not equally strong across dementias
Alzheimer’s disease has received more study than several other dementia types. The Atlas makes those differences visible.
See how the evidence is assessed →Detection methods answer different questions
Observation, routine EEG, longer recordings, and emerging technologies do not provide interchangeable evidence.
Understand events and EEG findings →The essential distinction
An observed episode and an EEG finding are related, but they are not the same evidence.
The Atlas keeps clinical events, recorded seizures, brief seizure-related discharges, and general slowing separate so that one finding is not treated as proof of another.
Explore the Atlas
Choose what you want to understand next.
Compare dementia types →See the most important recognition and evidence differences across all five guides.
Explore research insights →Understand what emerging detection studies found and what they have not established.
Review evidence and methods →See how population, recording method, study design, limitations, and source provenance shape each claim.
Put the Atlas into practice
Help a team recognize and describe reported episodes.
The Recognizing Possible Seizures in Dementia workshop helps teams notice, document, and communicate reported episodes more consistently using six fictional cases across five dementia types.