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. 2014 Jun 30;8:72. doi: 10.3389/fncir.2014.00072

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Copyright © 2014 Xiao, Zhang, Gong and Liang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Two stimulation protocols used in the present study. (A) Stimulus protocol with different light ON durations, in which 1-s, 5-s, and 9-s light ON were given randomly and separated by 1-s light OFF intervals in each trial, and repeated for 30 trials. (B) Stimulus protocol with different light OFF intervals, in which 1-s, 5-s, and 9-s light OFF intervals were presented randomly in each trial and were separated by 1-s light ON. Full-field sustained dim white light was given for 30 s before each stimulation protocol.