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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 inter-reinforcement interval on self-stimulation. (A) Mean lever-press rates are shown as a function of inter-reinforcement interval and pulse number. All 0-s interval values were significantly greater than respective 3- or 10-s interval values (Ps < 0.001). ^*P < 0.001, significantly greater than its 3- and 10-s values, but not from its 0-s value; ^#P < 0.05, significantly greater than its 3- and 10-s values, but lower than its 0-s value; ⁺, ^∧P < 0.001, not significantly different from its 3- and 10-s values, but lower than its 0-s value (B). Mean reinforcement rates are shown as a function of reinforcement interval and pulse number. All 0-s interval values were significantly greater than respective 1-, 3-, or 10-s interval values (Ps < 0.001). ^*P < 0.001, significantly greater than its 3- and 10-s values; ^#,+P < 0.01, significantly greater than its 10-s values.