Assessment of Apathy in a Real-life Situation, With a Video and Sensors-based System

A pilot study, ECOCAPTURE (ClinicalTrials.gov/NCT02496312, 2015), was conducted with participants diagnosed with the behavioral variant of frontotemporal dementia (bvFTD) matched for age, gender, and education level with healthy controls (n=7 per group). This study successfully validated the feasibility and conceptual framework of the ECOCAPTURE approach. The aim of this trial is to further develop and expand the ECOCAPTURE tool by applying it to a larger population, including individuals with the behavioral variant of frontotemporal dementia (bvFTD) and healthy control participants. The objectives of this study are to evaluate goal-directed behavior and identify apathy by analyzing data to establish a behavioral signature of apathy. Additionally, the study seeks to refine patient profiles by delineating the pathophysiological mechanisms underlying apathy, including cognitive processes, neural substrates, and neurohormonal pathways. The experiments take place on an experimental platform dedicated to the functional exploration of human behavior (PRISME, ICM core facility, Salpêtrière Hospital, Paris, France), to assess behavior under ecological conditions. The ECOCAPTURE paradigm mimics a naturalistic situation (i.e., waiting comfortably in a waiting room). Participants undergo a structured 45-minute controlled scenario, during which their behavior is systematically monitored to evaluate apathy and disinhibition. The PRISME platform is transformed into a furnished waiting room containing specific objects that provides opportunities to interact with the environment. The platform is equipped with a six-ceiling camera system (not hidden) covering the entire waiting room. The Media Recorder® software (NOLDUS Information Technology, Wageningen, the Netherlands) facilitates simultaneous video recordings from multiple cameras, ensuring synchronized capture across different viewpoints for comprehensive behavioral analysis. During the experiment, individuals' behavior is video-recorded, and their movement acceleration is measured using a wireless body sensor (Move II® triaxial accelerometer, Movisens GmbH, Karlsruhe, Germany) worn on the right hip. An eye-tracking system (SMI Eye Tracking Glasses 2 Wireless, ®SensoMotoric Instruments, Teltow, Germany / Tobii Pro Glasses 3, ®Tobii AB, Danderyd, Sweden) is added to the multimodal recording system, and the subjects wear eye-tracking glasses for a 7-minute period during the 45-minute experimental session. The subjects are informed at the time of initial consent that their behavior would be tracked and recorded by video cameras located in the room. Video data analysis is performed with The Observer XT software (Version 14.0, NOLDUS, Wageningen, The Netherlands) to identify the frequency and duration of behaviors. Behavioral metrics are obtained by behavioral coding from 45-minute video footage for each individual. Behavioral coding data is collected through the continuous sampling method, to identify all occurrences of behaviors and their duration. Behavioral coding is conducted based on two ethograms - the ECOCAPTURE apathy ethogram, the ECOCAPTURE disinhibition ethogram - (Batrancourt et al. 2022, "The ECOCAPTURE ethograms: apathy ethogram and disinhibition ethogram", Mendeley Data, V2, doi: 10.17632/mv8hndcd95.2) The ECOCAPTURE apathy ethogram includes behaviors divided in two behavioral categories: Motor patterns, Activity states. The ECOCAPTURE disinhibition ethogram includes behaviors divided in three disinhibition categories: Compulsivity, Impulsivity, Social disinhibition. Metrics built from collected data (video, sensors) are analyzed to reveal a behavioral signature of apathy. The study consists of two separate visits, each occurring on a different day, and includes the following components: the ECOCAPTURE observation phase in ecological conditions, a comprehensive neuropsychological assessment, a series of experimental tasks (some of which are computer-based), an MRI scan (including T1, T2, rs-fMRI, and MS-DWI), and a blood sample collection.