Bright Light: A Novel Treatment for Anxiety

2014-08-27 03:16:03 | BioPortfolio


The primary aim of this research was to examine the influence of bright light on anxiety in high-anxious young adults. In an acute exposure study, participants were randomly assigned to 45 min of either (1) bright light (3,000 lux) or (2) a placebo inactivated negative ion generator. Treatments were initiated ≤1 hr after awakening. At 10 min before and 30 min after the treatments, state anxiety, mood, and blood pressure were assessed.

Following the acute exposure study, participants performed a 5-week study. Following a a 1-week baseline, participants were randomly assigned to four weeks of daily exposure to either (1) bright light (45 min/day; 3,000 lux) or (2) placebo inactivated negative ion generator, which were initiated ≤1 hr after awakening. Before and after the experiment, clinical ratings were conducted with the Hamilton Anxiety Scale, the Hamilton Depression Scale, and the Clinical Global Impressions scale (CGI). Following baseline, and following each week of treatment, blood pressure, as well as questionnaires for state anxiety, depression, mood, sleep, and side effects were assessed.

Study Design

Allocation: Randomized, Control: Placebo Control, Endpoint Classification: Safety Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator, Outcomes Assessor), Primary Purpose: Treatment




Litebook Bright Light Box, Litebook inactivated negation ion generator (the placebo)


Chronobiology Lab, University of South Carolina
South Carolina
United States




University of South Carolina

Results (where available)

View Results


Published on BioPortfolio: 2014-08-27T03:16:03-0400

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Relatively bright light, or the dazzling sensation of relatively bright light, which produces unpleasantness or discomfort, or which interferes with optimal VISION, OCULAR. (Cline et al., Dictionary of Visual Science, 4th ed)

Combustion or burning in which substances combine chemically with oxygen typically giving out bright light, heat, and smoke.

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Failure or imperfection of vision at night or in dim light, with good vision only on bright days. (Dorland, 27th ed)

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