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Evening exposure to a light-emitting diodes (LED)-backlit computer screen affects circadian physiology and cognitive performance

Cajochen, C.; Frey, S.; Anders, D.; Spati, J.; Bues, M.; Pross, A.; Mager, R.; Wirz-Justice, A.; Stefani, O.


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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Cajochen, C.</dc:creator>
  <dc:creator>Frey, S.</dc:creator>
  <dc:creator>Anders, D.</dc:creator>
  <dc:creator>Spati, J.</dc:creator>
  <dc:creator>Bues, M.</dc:creator>
  <dc:creator>Pross, A.</dc:creator>
  <dc:creator>Mager, R.</dc:creator>
  <dc:creator>Wirz-Justice, A.</dc:creator>
  <dc:creator>Stefani, O.</dc:creator>
  <dc:date>2011-03-17</dc:date>
  <dc:description>nd an
increasing amount of time in front of computer screens equipped with
light-emitting diodes (LED) with a short wavelength (blue range).
Thus we investigated the repercussions on melatonin (a marker of the
circadian clock), alertness, and cognitive performance levels in 13
young male volunteers under controlled laboratory conditions in a
balanced crossover design. A 5-h evening exposure to a white LED-
backlit screen with more than twice as much 464 nm light emission
{irradiance of 0,241 Watt/(steradian

m
2
) [W/(sr

m
2
)], 2.1

10
13
photons/(cm
2

s), in the wavelength range of 454 and 474 nm} than
a white non-LED-backlit screen [irradiance of 0,099 W/(sr

m
2
),
0.7

10
13
photons/(cm
2

s), in the wavelength range of 454 and
474 nm] elicited a significant suppression of the evening rise in
endogenous melatonin and subjective as well as objective sleepiness,
as indexed by a reduced incidence of slow eye movements and EEG
low-frequency activity (1–7 Hz) in frontal brain regions. Concomi-
tantly, sustained attention, as determined by the GO/NOGO task;
working memory/attention, as assessed by "explicit timing"; and
declarative memory performance in a word-learning paradigm were
significantly enhanced in the LED-backlit screen compared with the
non-LED condition. Screen quality and visual comfort were rated the
same in both screen conditions, whereas the non-LED screen tended
to be considered brighter. Our data indicate that the spectral profile of
light emitted by computer screens impacts on circadian physiology,
alertness, and cognitive performance levels. The challenge will be to
design a computer screen with a spectral profile that can be individ-
ually programmed to add timed, essential light information to the
circadian system in humans.</dc:description>
  <dc:identifier>https://zenodo.org/record/1184290</dc:identifier>
  <dc:identifier>10.1152/japplphysiol.00165.2011</dc:identifier>
  <dc:identifier>oai:zenodo.org:1184290</dc:identifier>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:title>Evening exposure to a light-emitting diodes (LED)-backlit computer screen affects circadian physiology and cognitive performance</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
</oai_dc:dc>
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