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. Author manuscript; available in PMC: 2018 Apr 1.
Published in final edited form as: Behav Processes. 2016 May 20;137:33–39. doi: 10.1016/j.beproc.2016.05.003

Figure 1.

Figure 1

Figure 1

Figure 1

Food cup behavior during presentation of the tone on reinforced (R) and non-reinforced (NR) trials in rats that began training on postnatal day (PND) 30 (panel A), PND 40 (panel B) and PND 50 (panel C). Rats that began training on either PND 30 or PND 50 learned to discriminate between trial types on session 10, while rats that began training on PND 40 did not exhibit successful discrimination until session 12. * p < 0.01. Data are means ± SEM.