Figure 5.

Percentage of high probability choices across the extinction test. Participants in the control group favored the valued high probability action but not the devalued high probability action in the first 15-trial block, suggesting that they altered their choice behavior as a function of the change in the value of the outcomes. In contrast, stressed subjects still favored both the valued and the devalued high probability action over the corresponding low probability actions, indicating habitual performance. Note that stressed subjects favored the valued and devalued high probability actions even in the third 15-trial block, despite that the valued and devalued outcomes were no longer presented during the extinction test session. *p < 0.05 (corrected), valued and devalued high probability actions favored over the corresponding low probability actions; ^†p < 0.05 (corrected), valued high probability action favored over its low probability counterpart; data represent means ± SEM.