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. 2014 Feb 13;10(2):e1003466. doi: 10.1371/journal.pcbi.1003466

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© 2014 Lesaint et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Mean probabilities to engage at least once with the lever (A,C) or the magazine (B,D) during trials. Data are expressed as mean S.E.M. and illustrated in 50-trial (2-session) blocks. (A,B) Reproduction of Flagel et al. [21] experimental results (Figure 2 A,B). Sign-trackers (ST) made the most lever presses (black), goal-trackers (GT) made the least lever presses (white), Intermediate group (IG) is in between (grey). (C,D) Simulation of the same procedure (squares) with the model. Simulated groups of rats are defined as STs (; ; ; ; ; ; ; ; n = 14) in red, GTs ( ; ; ; ; ; ; ; ; n = 14) in blue and IGs (; ; ; ; ; ; ; ; n = 14) in white. The model reproduces the same behavioural tendencies. With training, STs tend to engage more and more with the lever and less with the magazine, while GTs neglect the lever to increasingly engage with the magazine. IGs are in between.

Inline graphic — Mean probabilities to engage at least once with the lever (A,C) or the magazine (B,D) during trials. Data are expressed as mean S.E.M. and illustrated in 50-trial (2-session) blocks. (A,B) Reproduction of Flagel et al. [21] experimental results (Figure 2 A,B). Sign-trackers (ST) made the most lever presses (black), goal-trackers (GT) made the least lever presses (white), Intermediate group (IG) is in between (grey). (C,D) Simulation of the same procedure (squares) with the model. Simulated groups of rats are defined as STs (; ; ; ; ; ; ; ; n = 14) in red, GTs ( ; ; ; ; ; ; ; ; n = 14) in blue and IGs (; ; ; ; ; ; ; ; n = 14) in white. The model reproduces the same behavioural tendencies. With training, STs tend to engage more and more with the lever and less with the magazine, while GTs neglect the lever to increasingly engage with the magazine. IGs are in between.