Light helmet for Alzheimer's shows promise, but study cut short

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

Inclusion Criteria: * Male and/or Female ; * Age between 55-85 years old ; * Diagnostic of AD according to international criteria of McKhann et al., 2011 \[1\] ; * Mild-to-moderate Alzheimer's disease stage with MMSE score between 16 and 26 ; * Symptomatic treatments specific to AD (Memantine, acetylcholinesterase inhibitors) and pyshotropic treatments (anxiolytics, anti-depressants, neuroleptics) are allowed but must be maintained at fixed doses during the 4 weeks previous to inclusion and during all the study length ; * Patient approval for biological, eletrophysiological and imaging tests ; * Enough availability to participate daily to the proposed treatment sessions ; * Given informed, free consent, written and signed by participant and investigator (at the latest on the day of inclusion and before any examination needed for the research) ; * Affiliated to social security regime or beneficiary of such a regime ; * Patient given approval to perform a second lumbar puncture (without contraindication) if tests results and/or neurological follow-up need a CSF test for biomarkers ; Exclusion Criteria: * Exclusion criteria: * Clinical and paraclinical details insufficient for AD diagnostic ; * Genetic form of AD (genetic mutation characterized) ; * No caregiver to complete neuropsychological scales and evaluation forms ; * Patient living in a medical institution ; * Illiteracy or inability to perform psycho-behavioral tests ; * Physical or neurosensory problems susceptible to interfere with tests * Contraindication or refusal to perform MRI imagerie examinations, PET-FDG, P300 and/or actimetry tests ; * Patient carrying a pacemaker device or a ferromagnetic compound ; * Short-term life-threatening pathologies (evolutive cancer, unstable cardiac failure, liver or kidney failure, severe respiratory insufficiency) ; * Chronic psychosis or psychotic episodes ; * Alcohol or drug addiction ; * Epilpesy or other non-neurodegenerative diseases of the central nervous system ; * Deficits in B12 and non-supplemented folic acid levels ; * Untreated hypothyroidism ; * Major skin lesions on treatment application regions (possibility to apply a bandage during the treatment if minor lesions) ; * Recent major chirurgical intervention at the abdomen in the past three month before inclusion ;