Abstract
Background
Multi-luminaire light stimulation is a novel technique based on luminance flicker with low modulation depth created by two spatially adjacent light sources aimed to deliver 40 Hz neural stimulation while reducing discomfort, offering potential non-pharmacological, noninvasive, and in-home interventions for Alzheimer's disease and dementia. However, these cognitive effects have never been validated with electroencephalography (EEG).
Objective
In this study we aim to assess the ability of multi-luminaire light stimulation to evoke a 40 Hz EEG response under two conditions: direct viewing and indirect viewing.
Methods
The M + BrainCare light by Delta Electronics was used in this study. Participants were stimulated either directly by looking at the light (direct viewing condition), or off of the reflection from a piece of paper to mimic everyday reading (indirect viewing condition). EEG power at 40 Hz from these conditions were compared to a positive control of 40 Hz luminance flicker with 100% modulation depth (stroboscopic flicker).
Results
In both multi-luminaire conditions, there was no significant 40 Hz EEG oscillations. In contrast, stroboscopic control elicited robust entrainment in all participants, propagating to frontal regions.
Conclusions
Our results question the efficacy of multi-luminaire technology, specifically the Delta M + BrainCare light, for evoking 40 Hz neural responses. Future studies involving multi-luminaire technology should pay special attention to EEG validation prior to making claims about neural oscillation and brain health.
Keywords
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