Abstract：
:Bubbles is a classification image technique that randomly samples visual information from input stimuli to derive the diagnostic features that observers use in visual categorization tasks. To reach statistical significance, Bubbles performs an exhaustive and repetitive search in the stimulus space. To reduce the search trials, we developed an adaptive method that uses reinforcement learning techniques to optimize sampling by exploiting the observer's history of categorization. We compared the performance of the original and the adaptive Bubbles algorithms in a model observer and eight human adults who all resolved the same visual categorization task (i.e., five facial expressions of emotion). We demonstrate the feasibility of a substantial reduction (by a factor of ∼2) in the number of search trials required to locate the same diagnostic features with the adaptive method, but only when the observer reaches a performance threshold of 50% correct for each expression category. When this threshold is not reached, both the original and adaptive algorithms converge in the same number of trials.
journal_name
Vision Resjournal_title
Vision researchauthors
Wang HF,Friel N,Gosselin F,Schyns PGdoi
10.1016/j.visres.2011.04.007subject
Has Abstractpub_date
2011-06-21 00:00:00pages
1318-23issue
12eissn
0042-6989issn
1878-5646pii
S0042-6989(11)00141-6journal_volume
51pub_type
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