Clinical Observation Architecture

Four domains for organizing possible seizure-related presentations in dementia.

The Dementia Seizure Spectrum™ (DSS) Framework provides a structured vocabulary for organizing observable events across four domains: Seizure Events, Movement Changes, Awareness Changes, and Behavioral Changes. It is designed for licensing and integration across health technology, sensor systems, clinical software, life sciences, research, and healthcare applications worldwide.

The framework organizes observations. It does not determine whether an event was a seizure. DSEF provides the separate evaluation layer.

The four observation domains

A consistent structure for organizing what was observed.

The four domains organize observable events without presuming their cause. An event may involve one domain or several. DSEF subsequently evaluates onset, duration, recurrence, context, background risk, recovery, competing explanations, and safety conditions.

Domain 01

Seizure Events

Most Recognized

The events standard care is designed to recognize — a minority of total seizure burden in Alzheimer's disease.

Observable events commonly associated with conventionally recognized seizure presentations.

Examples may include loss of consciousness, tonic stiffening, rhythmic jerking, incontinence during an event, or a marked post-event change from the person's usual baseline.

Observable Signals

Loss of or marked change in consciousness Tonic stiffening Rhythmic jerking Incontinence during an event Post-event change from baseline

Clinical Context

These events may be easier to recognize than more subtle presentations, but they still require documentation of onset, duration, responsiveness, recovery, and competing explanations. The DSS Framework organizes the observation; it does not establish the diagnosis.

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Domain 02

Movement Changes

Partially Recognized

Involuntary motor activity that may appear in isolation or alongside Domain 1 or Domain 3 events.

New, abrupt, episodic, or stereotyped movement changes that may warrant structured evaluation.

Examples may include chewing or lip-smacking movements, rhythmic limb activity, sudden stiffening, or repetitive hand movements. Observers should document what occurred without presuming its cause.

Observable Signals

Chewing or lip-smacking movements Rhythmic limb activity Sudden stiffening Repetitive hand movements Responsiveness during the movement Duration, recurrence, and recovery

Clinical Context

Movement changes can have neurological, medication-related, behavioral, metabolic, or other explanations. Their significance depends on the broader event pattern. DSEF evaluates that context after the observation has been organized within the DSS Framework.

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Domain 03

Awareness Changes

Frequently Missed

The most frequently missed type of silent seizures in dementia care.

Sudden or episodic changes in responsiveness, engagement, communication, or awareness.

Examples may include blank staring, behavioral arrest, reduced responsiveness, speech interruption, or a clear post-event change from baseline. Exact onset, duration, responsiveness, and recovery should be documented.

Observable Signals

Blank or fixed staring Sudden reduction in responsiveness Behavioral arrest Speech interruption Event amnesia when assessable Post-event change from baseline

Clinical Context

Awareness changes are nonspecific and may overlap with syncope, delirium, sleep-related events, medication effects, metabolic conditions, or dementia-related fluctuation. The DSS Framework provides a consistent observation structure; DSEF evaluates the full pattern and competing explanations.

Read the field guide →
Domain 04

Behavioral Changes

Most Commonly Misattributed

Events most commonly misattributed to behavioral symptoms of dementia or medication effects.

Abrupt, episodic, or stereotyped changes in behavior, affect, language, or purposeful activity.

Examples may include sudden fear, agitation, speech interruption, repetitive purposeless actions, or a marked episodic change from baseline. Behavioral observations alone do not establish seizure activity.

Observable Signals

Abrupt fear or agitation Episodic mood or affective change Speech interruption Repetitive purposeless actions Clear onset and endpoint Stereotyped recurrence Recovery pattern

Clinical Context

This domain requires careful differential evaluation. Infection, delirium, pain, medication effects, sleep disruption, environmental triggers, psychiatric conditions, and dementia-related changes may produce similar observations. DSEF is designed to consider those competing explanations.

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How the intelligence architecture works

One architecture connects observation, evaluation, and response.

Seagull Health separates observation, evaluation, and response into distinct but connected layers. The DSS Framework organizes what was observed. DSEF evaluates the event pattern, background context, competing explanations, and safety conditions. SeizureSafe™ translates the structured evaluation into response and follow-through pathways. CRISP™ supports the evidence architecture across the system.

01 — Capture

An observable event

A person, device, platform, researcher, or clinical system captures what occurred, including onset, duration, responsiveness, movement, behavior, context, and recovery. The observation remains neutral at this stage.

02 — Organize

A DSS Framework domain profile

The DSS Framework structures the observation across Seizure Events, Movement Changes, Awareness Changes, and Behavioral Changes. One event may activate one domain or several without establishing its cause.

03 — Evaluate

A structured DSEF evaluation

DSEF combines the domain observations with background risk, onset, duration, recurrence, recovery, contextual features, competing explanations, documentation quality, and safety conditions. The result is a transparent, non-diagnostic evaluation for qualified review.

04 — Translate

SeizureSafe™ response logic

SeizureSafe translates the structured evaluation into configurable pathways for recognition, safety response, documentation, communication, escalation, and follow-through. The pathway can be adapted to the governance and workflow of the licensing partner.

CRISP™ Supporting Intelligence Architecture

Supporting evidence intelligence across the DSS Framework, DSEF, and SeizureSafe.

The foundation everything builds on

One taxonomy beneath every brief, protocol, and partnership.

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The DSS Framework is a clinical classification tool for organizing observable signals against the published literature. It is not a diagnostic instrument and does not establish that any individual event was a seizure. Diagnosis requires clinical evaluation. Domain recognition characterizations reflect patterns described in the peer-reviewed evidence base.