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. Author manuscript; available in PMC: 2017 Jun 1.
Published in final edited form as: Biol Psychiatry. 2015 May 7;79(11):878–886. doi: 10.1016/j.biopsych.2015.04.026

Figure 1.

Figure 1

Adult and adolescent rats learn instrumental associations and extinction at similar rates. (A) Task Schematic: When rats nose poked into the lit port, a reward was delivered following a 2-second delay. After animals retrieved the sugar reward, a 15 second ITI began. Sessions 1–6 proceeded in this fashion for 30 minutes each (Learning and Maintenance). Session 7 began with 30 rewarded trials, and then proceeded to 30 minutes of extinction in which responses were not rewarded (Extinction). Session 8 was 30 minutes of extinction trials only. (B) There were no differences between adolescents (n = 7) and adults (n = 11) in total trials completed per session. During extinction in sessions 7 and 8, there were no group differences in trials completed. Total trials completed in each session are depicted as the session mean ± SE, across all animals in an age group. Data are depicted for Sessions 1–6 (prior to extinction) and Sessions 7E and 8. Underlined sessions (3–6) and extinction sessions were used for electrophysiological analysis. The shaded portion of the figure depicts extinction sessions. Data from session 7R are not plotted, as all animals were required to complete exactly 30 trials.