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. Author manuscript; available in PMC: 2009 Jul 6.
Published in final edited form as: Neurosci Biobehav Rev. 2007 Aug 10;32(2):219–236. doi: 10.1016/j.neubiorev.2007.07.008

Figure 5.

Figure 5

In a probabilistic classification task, subjects predict a category outcome (vanilla or chocolate ice cream) based on features on a Mr. Potatohead doll (moustache, hat, bowtie or glasses). (A) Training was either feedback-based, as in prior studies, or observational, involving no feedback. (B) Controls showed similar levels of learning under both conditions; individuals with basal ganglia disruption due to Parkinson’s disease (PD) were impaired at feedback-based learning, but not at observational learning (Shohamy et al., 2004b).