Document Detail

Effects of daytime light exposure on cognitive brain activity as measured by the ERP P300.
MedLine Citation:
PMID:  25447474     Owner:  NLM     Status:  Publisher    
Exposure to light modulates not only human alertness but also cognitive functions. The present study examined the temporal dynamics of the effects of light exposure on cortical activity related to cognitive processes. Event-related potentials (ERPs) were measured while participants performed an auditory oddball task during exposure to short-, medium- or long-wavelength light or darkness. Experiments were conducted in the daytime. After a 10-min period of darkness, one of the three lights was presented for 28min. In the control condition, darkness was maintained for the entire session. The ERP component observed approximately 300ms after the onset of the target stimulus (P300) was analyzed. The amplitude of P300 was larger after 5-20min of exposure to short-wavelength light than at equivalent time points in the darkness. No differences were observed in the amplitude of P300 between the medium- or long-wavelength light condition and darkness at any time point. These results suggest that the amount of attentional resource allocated to the oddball task was increased by daytime exposure to short-wavelength light, and that following approximately 5min of exposure the impact of light on cortical activity related to cognitive processes was able to be detected.
Yosuke Okamoto; Seiji Nakagawa
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-10-20
Journal Detail:
Title:  Physiology & behavior     Volume:  -     ISSN:  1873-507X     ISO Abbreviation:  Physiol. Behav.     Publication Date:  2014 Oct 
Date Detail:
Created Date:  2014-12-2     Completed Date:  -     Revised Date:  2014-12-3    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier Inc. All rights reserved.
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