IPAS | Institutional Reference Edition
A
Aberrant Light Manifestation — Unexplained illumination, flashes, or directional beams without a physical source. (Associations: Environmental distortion; visual anomaly; potential electromagnetic correlation.)
Acoustic Footfall Event — Perceived footsteps in the absence of visible movement or physical presence. (Associations: Auditory anomaly; architectural resonance; corridor‑linked.)
Affective Imprint — Sudden emotional overlay not originating from the witness’s internal state. (Associations: Cognitive anomaly; historical residue; site‑specific.)
Ambient Frequency Shift — Perception of tonal change, low hums, or vibrational presence without equipment. (Associations: Auditory anomaly; EMF fluctuation; mechanical mimicry.)
Anomalous Shadow Form — Shadow‑like movement not corresponding to any physical object or light source. (Associations: Visual anomaly; peripheral perception; liminal space.)
Architectural Pressure Zone — Localized sensation of heaviness or constriction tied to structural geometry. (Associations: Somatic anomaly; spatial distortion; stairwells and thresholds.)
B
Bilateral Presence Event — Sensation of being flanked or approached from both sides simultaneously. (Associations: Presence phenomenon; somatic cue; corridor or cellblock pattern.)
Boundary Distortion — Perception that walls, doorways, or corners shift in size or proportion. (Associations: Spatial anomaly; depth distortion; liminal architecture.)
Breath-Shift Phenomenon — Sudden cold or warm airflow perceived as “breath” without environmental cause. (Associations: Temperature anomaly; airflow irregularity; proximity impression.)
Brief Apparitional Flash — Split‑second visual form, often humanlike, appearing and vanishing instantly. (Associations: Visual anomaly; high‑velocity perception; low documentation consistency.)
Background Looping Event — Repetitive environmental sound (knock, drip, shuffle) with no physical source. (Associations: Environmental repetition; auditory anomaly; cyclical pattern.)
C
Cold Zone Localization — A sharply defined cold area not explained by ventilation or structural factors. (Associations: Temperature anomaly; environmental shift; recurrent in historical sites.)
Cognitive Overlay — Interpretive or symbolic imagery imposed onto neutral sensory input. (Associations: Cognitive anomaly; cultural influence; mythic overlay.)
Corridor Presence Effect — Strong impression of being observed or accompanied specifically within hallways. (Associations: Presence phenomenon; architectural influence; multi‑witness alignment.)
Cross‑Vector Movement Event — Sensation or perception of movement occurring simultaneously in two opposing directions.
Cross‑Witness Convergence — Independent witnesses reporting similar impressions without prior discussion. (Associations: Perceptual convergence; reliability indicator; multi‑sensory potential.)
Compression Event (Spatial) — Sudden narrowing or “closing in” sensation within a room or passage. (Associations: Spatial anomaly; somatic response; structural resonance.)
Cyclic Apparitional Pattern — Recurring visual or sensory event following a predictable temporal rhythm. (Associations: High‑complexity anomaly; recurrence mapping; archival significance.)
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