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. 2014 May 6;8:155. doi: 10.3389/fnbeh.2014.00155

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Copyright © 2014 Ilango, Kesner, Broker, Wang and Ikemoto.

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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Effects of parametric manipulations of photo-pulse trains on self-stimulation. The data are mean with s.e.m. (A) Pulse duration was varied. ^*P < 0.005, significantly lower than the 3- or 10–ms value. (B) Photo intensity was varied. ^*P < 0.01, significantly lower than the 1- or 10-mW value; ^#P < 0.05, significantly greater than the 0.1-ms value. (C) Pulse frequency was varied. ^*P < 0.005, significantly lower than the 20- or 50-Hz values; ^#P < 0.05, significantly greater than the 8-Hz value. (D) Pulse number was varied. ^*P < 0.005, significantly greater than the 0-pulse value; ^#P < 0.05, significantly greater than the 0- and 2-pulse values. (E) Summarized are effects of the factors: duration, intensity, frequency, and number. The maximal values of the factors (10 ms, 10 mW, 50 Hz, and 16 pulses, respectively) are set at 100%, and the rest of the values of each factor are transformed accordingly.