Relation between choice-induced preference change and depression
Most experimental studies of depressive symptom effects on decision-making have examined situations in which a single correct answer exists based on external circumstances (externally guided decision-making, e.g., gambling task). In addition to such decisionmaking, for decision-making of other types, no correct answer exists based on external circumstances (internally guided decision-making, e.g., preference judgment). For internally guided decision-making, a phenomenon is known by which
... nce for the chosen item increases and preference for the rejected item is decreased after choosing between two equally preferred items which is designated as choice-induced preference change. Recent reports suggest that this phenomenon is explainable by reinforcement learning theory just as it is with externally guided decision-making. Although many earlier studies have revealed the effects of depression in externally guided decision-making, the relation between depressive symptoms and choice-induced preference change remains unclear. This study investigated the relation between depressive symptoms and choice-induced preference change using the blind choice paradigm. Results show that depressive symptoms are correlated with change in preference of rejected items (Spearman's r = .28, p = .04): depressed individuals tend to show less decreased preference of rejected items. These results indicate that individual differences of depressive symptoms affect choice-induced preference change. We discuss the mechanisms underlying the relation between depression and choiceinduced preference change. Measures Self-reported depressive symptom level. Each participant's tendency to depression was assessed using the Japanese version of the Center for Epidemiological Studies Depression Scale Relation between choice-induced preference change and depression PLOS ONE | https://doi. Fig 2. Experimental tasks. Experimental tasks constructed in three sessions: Pre-choice rating task, Blind choice task, and Post-choice rating task. In the Pre-choice rating task, participants were presented items for 3 s. They rated their preference for it on an eight-point scale. In the blind choice task, participants were instructed that two images that were rated in the pre-choice rating task were presented subliminally. Of the two images, they were asked to choose the one which they preferred. In fact, however, two identical dummy images were presented for 7 ms. After the choices were made, the two images were presented. The red rectangle denotes that it was chosen blindly. In the post-choice rating task, participants were presented the same image stimuli as those of the pre-choice rating task. Their preference was rated again. https://doi.org/10.1371/journal.pone.0180041.g002 Relation between choice-induced preference change and depression PLOS ONE | https://doi.