Emotion

Recent studies show that emotional states can be discriminated by physiological responses. This physiological regulation results from the action of enzymes and hormones that represent the activity of the autonomic nervous system. The measurement of specific biomarkers, using non-invasive biological tests in saliva, would therefore provide physiological data on an individual's emotional state in response to stimuli, particularly olfactory stimuli.

Acquired brain injuries (ABIs) frequently cause emotional and behavioral disorders that impair independence and quality of life, particularly in institutions. Virtual reality (VR), already used in various mental and neurological disorders, offers therapeutic potential that remains largely unexplored in this context. Multisensory devices offer enhanced immersion that can potentially increase the relaxation and calming effect. Their use in specialized care home (SCH) could provide additional support for care. The main objective of the study is to measure the effect of an 8-week multisensory VR relaxation program on the most significant emotional and behavioral disorders in adults with acquired brain injury living in SCH. The SCED method with multiple baselines across subjects (ABA) is used with three adult residents with ABCI and behavioral disorders living in SCH. The study consists of three phases (baseline, intervention, follow-up), during which the three main emotional and behavioral disorders of each resident are assessed weekly based on observations made throughout the week. Additional measures include the assessment of the socio-emotional profile by the care team (ECCSEG) and the emotional distress experienced by residents (QOLIBRI), collected twice per phase. The intervention consists of eight weeks of VR relaxation (VirtySens®), with two 15-minute sessions per week. All measurements taken during the experiment will be anonymized and used only by the investigators, who are fully aware of the European GDPR (General Data Protection Regulation) concerning the protection of personal data.

Self-affirmation (SA) theory proposes that people are motivated to maintain a positive self-image of being worthy, stable, and capable. Self-affirmation (SA) manipulations have been shown to effectively increase self-worth as well as reduce cardiovascular reactivity while enhancing cardiovascular recovery in response to stress. While SA is discussed as a way to alleviate grief, its effect on cardiovascular reactivity (CVR) and recovery to grief recall has yet to be studied within laboratory settings. This study proposes an experimental design to examine how an in-lab manipulation promoting self-affirmation can improve patients' cardiovascular responses during and after a grief recall procedure. The investigators hypothesized that grief severity (a continuous variable) interacts with condition (a categorical variable with two levels, i.e., SA intervention vs. control) to predict CV reactivity and recovery as outcomes. Primary Objective 1: To investigate effects of self-affirmation intervention on cardiovascular responses among grieving participants during and after grief recall. Secondary Objective 1: To investigate the relationship of grief severity with psychological stress.