Could a light helmet ease lewy body dementia?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion criteria: * Man or woman, 50 years or older * Probable DLB diagnosed according to the criteria of McKeith et al., 2017, or the criteria of McKeith et al., 2020 for prodromal DLB * Score on the Mini Mental State Examination (MMSE; Folstein et al., 1983) ≥ 18/30 at their last medical visit * Good mastery of the French language * Accompanied by a caregiver or a person able to provide information about them (interview, by telephone). * Able to understand the objectives and risks associated with the research and to give informed consent, dated and signed * Covered by a social health insurance plan * Having a head circumference between 54 and 62 cm. Exclusion criteria: * Not able to understand the objectives and risks related to research and to give informed consent * Presence of another neurological disorder, including but not limited to brain tumors, stroke with potential cognitive impairment, or diagnosis of another progressive neurological disease (e.g., Alzheimer's disease, Parkinson's disease, etc.), and as determined by the investigator * Having an MMSE score \< 18 at the screening visit * Unable to undergo a brain MRI due to medical reasons * Participants whose follow-up would likely be disrupted during the study period (e.g., due to planned relocation or other reasons) * Insufficient proficiency of the French language * Participants experiencing an emergency of life-threatening situation * Alone, without a caregiver present * Participants presenting with a head/scalp injury * Participants with a silicone allergy * Participants with cranial/skull shape abnormalities * Participants with a head circumference outside the range of 54-62 cm * Participants requiring life support, continuous monitoring, and/or implanted medical devices (AIMD) * Participants taking the antiepileptic Keppra (Levetiracetam) * Participants whose anticholinesterase treatments have been changed within the past 2 months * Participants whose antipsychotic treatments have been changed within the last 15 days * Pregnant or breastfeeding women