Study on effects of flickering violet light on sleep and cognitive functions

Effects of gamma-band flickering violet lights on sleep and cognitive functions - Gamma-band flickering violet light and sleep/cognitive functions

Status

Recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000037456

Enrollment

Registered

2019-07-23

Start date

2019-08-13

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Interventions

Exposure of flickering violet light (365nm) (40 Hz) will be exposed for 3 hours during daytime Exposure of flickering violet light (365nm) (10 Hz) will be exposed for 3 hours during daytime

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Healthy adults (male and female) aged from 20 to 49 years old

Exclusion criteria

Exclusion criteria: History of major disorder which possibly affect results History of alcohol and substance use disorder and/or habits of binge drinking. History of drugs which possibly affect results Pregnant, Breastfeeding, or having a plan for pregnancy Others who the researcher judged inappropriate

Design outcomes

Primary

Measure	Time frame
Sleep structure using polysomnography	—

Secondary

Measure	Time frame
Sleep parameters(sleep onset latency, sleep efficiency, total sleep time, wake after sleep onset) Cognitive functions (Psychomotor vigilance task, n-back, Digit-Symbol Substitution test, Trail making test) Alertness(Subjective sleepiness, Karolinska drawsiness test) Electroencephalogram during light exposure	—

Countries

Japan

Contacts

Public ContactShingo Kitamura

National Center of Neurology and Psychiatry Sleep-Wake Disorders

s-kita@ncnp.go.jp042-341-2712(6267)

Outcome results