An aggregate must identify its source atoms, interpretation selection, affect role, method and coverage. Repeated theme membership must not multiply contributions. Primary, secondary and tertiary states must not be silently averaged together.
An unweighted per-axis mean of one selected role across unique atoms is a proposed baseline, not an established measure of psychological meaning. Missing axes are excluded with contributing counts; no contributors means unavailable. An aggregate must not appear to be an original memory record. Revised metrics, context links and memberships must refresh their representations without changing source identity.