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SOMNATEK SLEEP HEALTH CENTER
WEXLER UNIVERSITY COLLABORATIVE RESEARCH PROGRAM
PROTOCOL 7A — LONGITUDINAL ENVIRONMENTAL RECALL STUDY
INTERNAL DOCUMENT — NOT FOR DISTRIBUTION
Purpose. This document describes the research protocol for the Somnatek Longitudinal Recall Program, conducted under Protocol 7A. The study was initiated in 2008 under the joint direction of Dr. Mara Ellison (Somnatek Sleep Health Center) and Dr. Edwin Vale (Wexler University, Department of Cognitive and Behavioral Neuroscience). The study enrolled participants meeting inclusion criteria for chronic sleep-related complaints with demonstrated REM recall capacity.
Enrollment criteria. Participants were recruited from the Somnatek clinical population and screened for recall consistency across two baseline in-lab sessions. Participants demonstrating a baseline recall rating of 2/5 or higher on the Somnatek Environmental Recall Questionnaire (ERQ) were eligible for enrollment. Participants were not informed of the specific environmental elements under observation.
Session structure. Each participant completed in-lab polysomnography sessions on a monthly schedule, with semi-annual breaks during the first two years. Post-sleep debriefs were conducted by the attending technician using a structured verbal protocol. Technician notes were transcribed to session summary forms. Physician review was completed by Dr. Ellison within 72 hours of each session.
Observation scope. The primary observation target was unprompted recall of a consistent set of environmental elements across the participant cohort. Technicians were instructed not to prompt for specific elements, not to confirm or deny inter-participant consistency, and not to describe or interpret recalled content to participants. The protocol was designed to minimize contamination of independent recall.
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Environmental elements under observation. The following elements were designated as primary observation targets in the study protocol. Technicians recorded the presence or absence of each element in participant recall following each session. The revised checklist (form 7A-EC-004, effective 2010-09) incorporated all elements below.
- A corridor or hallway of indeterminate length
- Directional characteristic of the corridor (left-bending)
- A reception or waiting area
- A door (chromatic designation: blue; positional designation: left)
- A vending machine adjacent to the main corridor
- A visible room number on a secondary door at the corridor terminus
- Written text of directive character on a corridor wall
Data handling. Session summary forms were retained in the participant record and reviewed by Dr. Ellison. Cross-participant consistency analysis was conducted by Dr. Vale on a quarterly basis. Cross-reference notations were added to technician notes where inter-participant consistency was confirmed. Raw session data was not shared with participants.
Amendment log. The protocol was amended four times during the study period. Amendment details are documented in the supplemental index (ref: 7A-SUPP-003). The most significant amendment, effective 2010-09, extended the environmental checklist to include the room number element and the directive wall text element following their unprompted appearance in participant recall across multiple cohort members simultaneously.
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