A recent study demonstrated that individuals making experience-based choices underweight small probabilities, in contrast to the overweighting observed in a typical descriptive paradigm. We tested whether trial-by-trial feedback in a repeated descriptive paradigm would engender choices more correspondent with experiential or descriptive paradigms. The results of a repeated gambling task indicated that individuals receiving feedback underweighted small probabilities, relative to their no-feedback counterparts. These results implicate feedback as a critical component during the decision-making process, even in the presence of fully specified descriptive information. A model comparison at the individual-subject level suggested that feedback drove individuals' decision weights toward objective probability weighting.
Strong error-related activity in medial prefrontal cortex (mPFC) has been shown repeatedly with neuroimaging and event-related potential studies for the last several decades. Multiple theories have been proposed to account for error effects, including comparator models and conflict detection models, but the neural mechanisms that generate error signals remain in dispute. Typical studies use relatively low error rates, confounding the expectedness and the desirability of an error. Here we show with a gambling task and functional magnetic resonance imaging that when losses are more frequent than wins, the mPFC error effect disappears, and moreover, exhibits the opposite pattern by responding more strongly to unexpected wins than losses. These findings provide perspective on recent ERP studies and suggest that mPFC error effects result from a comparison between actual and expected outcomes.
Although Daniel Batson's (1976) construct of “Religion as Quest” has been widely applauded as an important theoretical innovation in the assessment of religious motivation, there are lingering concerns regarding the validity of the Quest construct. This study follows up some past suggestions in the literature that Quest may be a multidimensional construct and that facets of Quest may have very different relationships with religious variables. To test these hypotheses we constructed a multidimensional measure of Quest and administered it to 183 college students along with measures of spiritual well-being, Christian orthodoxy, extrinsic and intrinsic religiosity, and Batson's 12-item Quest measure. Overall, the results suggest that Quest is indeed a multidimensional construct and that the dimensions of Quest need to be assessed separately to assess Quest's construct validity. Specifically, two broad trends were noted. First, some facets of Quest seem to capture the free-roaming existential Quest Batson has frequently described. However, other facets of Quest seem to be compatible with orthodox Christian beliefs, suggesting that possessing metaphysical convictions are compatible with Quest-like attributes.
Contemporary computational accounts of instrumental conditioning have emphasized a role for a model-based system in which values are computed with reference to a rich model of the structure of the world, and a model-free system in which values are updated without encoding such structure. Much less studied is the possibility of a similar distinction operating at the level of Pavlovian conditioning. In the present study, we scanned human participants while they participated in a Pavlovian conditioning task with a simple structure while measuring activity in the human amygdala using a high-resolution fMRI protocol. After fitting a model-based algorithm and a variety of model-free algorithms to the fMRI data, we found evidence for the superiority of a model-based algorithm in accounting for activity in the amygdala compared to the model-free counterparts. These findings support an important role for model-based algorithms in describing the processes underpinning Pavlovian conditioning, as well as providing evidence of a role for the human amygdala in model-based inference.
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