title: Exemplar similarity and rule application.
abstract: We report four experiments examining effects of instance similarity on the application of simple explicit rules. We found effects of similarity to illustrative exemplars in error patterns and reaction times. These effects arose even though participants were given perfectly predictive rules, the similarity manipulation depended entirely on rule-irrelevant features, and attention to exemplar similarity was detrimental to task performance. Comparison of results across studies suggests that the effects are mandatory, non-strategic and not subject to conscious control, and as a result, should be pervasive throughout categorization.
authors.affiliation: School of Psychology, Cardiff University, Wales CF10 3AT, UK. hahnu@cardiff.ac.uk
authors.forename: Ulrike
authors.initials: U
authors.lastname: Hahn
authors.forename: Mercè
authors.initials: M
authors.lastname: Prat-Sala
authors.forename: Emmanuel M
authors.initials: EM
authors.lastname: Pothos
authors.forename: Duncan P
authors.initials: DP
authors.lastname: Brumby
mesh_terms: D000328:Adult; D001288:Attention / Q000502:physiology*; D002755:Choice Behavior / Q000502:physiology; D003210:Concept Formation / Q000502:physiology*; D004193:Discrimination Learning / Q000502:physiology; D006801:Humans; D009483:Neuropsychological Tests; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology*