CMEG key terms

A magnetic sensor measuring field under its actual geometry and operating requirements rather than directly identifying individual neurons.

A sensor arrangement responding to spatial field differences that can reduce some distant interference but not every artifact.

A measurement characterizing aspects of system and environmental noise without capturing every patient-related source of contamination.

A test under known conditions used to evaluate specified system performance without guaranteeing every clinical localization.

Review of relevant implants, accessories and system-specific risks before the proposed recording or stimulation activity.

The relationship between input contact impedances that can affect noise rejection and should be considered with actual equipment.

Accurate recording of observed patient behavior and timing when safe, without independently assigning an unsupported diagnosis.

A cold, pressure or atmospheric risk associated with the actual cryogenic system, requiring trained procedures and response.

Measurement of a difference between inputs with designed rejection of common signals, subject to actual equipment and contact conditions.

Misrepresentation of higher-frequency content at lower apparent frequencies when sampling and filtering conditions are unsuitable.

Variation in response timing across trials that can blur a time-locked average even when individual responses exist.

Interference that repeats systematically with the event or stimulus and may therefore persist during averaging.

Determination of the head’s relationship to the sensor coordinates using the appropriate system-specific procedure and quality checks.

Stored timing information linked to an event that must be related correctly to actual stimulus delivery or behavior.

Recording of complementary electrical and magnetic measurements whose different sensitivities can affect the visibility of an event.

Evidence that the person understood and performed the intended activity sufficiently for the proposed mapping interpretation.

A model prediction of sensor measurements from assumed source currents, geometry and relevant head-model conditions.

An inferred source explanation for measured fields that depends on constraints and is not uniquely determined by the measurements alone.

Alignment of functional measurement coordinates with structural anatomy, requiring correct identity, labels, landmarks and quality review.

A measure of model-data agreement that does not independently establish anatomical accuracy, epileptogenicity or a clinical outcome.

A record made with reliable timing near the event rather than reconstructed later from uncertain memory.

A communication in which the finding is stated and receipt or understanding is confirmed through the agreed pathway.

A traceable history of settings, exclusions, software and transformations needed to review or reproduce an analysis.

Retention of the original measurement and relevant metadata so later processing does not replace the only source evidence.