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. Author manuscript; available in PMC: 2016 Apr 15.
Published in final edited form as: Int J Comp Psychol. 2015;28:uclapsych_ijcp_26255.

Figure 2.

Figure 2

The overall rate during the development of the acquisition in the peak procedure task in blocks of six sessions. 2A) A significant increase of the overall rate in the d-amphetamine group is observed in the first block (1–6), but only in comparison to the haloperidol group. 2B) The overall rate of the d-amphetamine group was higher than the control or haloperidol groups in the second block (7–11). 3C) The overall rate effect showed no differences between the three groups in the third block (12–16). 3D) The haloperidol group showed a lower response rate compared to the control and d-amphetamine groups in the fourth block (17–21).