title: Nonstrategic contributions to putatively strategic effects in selective attention tasks.
abstract: Proportion compatible manipulations are often used to index strategic processes in selective attention tasks. Here, a subtle confound in proportion compatible manipulations is considered. Specifically, as the proportion of compatible trials increases, the ratio of complete repetitions and complete alternations to partial repetitions increases on compatible trials but decreases on incompatible trials. This confound is demonstrated to lead to an overestimation in the magnitude of the proportion compatible effect in the context of both a Stroop and a Simon task. Implications for previous research and directions for future research using proportion compatible manipulations are discussed.
authors.affiliation: Department of Psychology, University of Waterloo, Waterloo, Ontario, Canada. efrisko@watarts.uwaterloo.ca
authors.forename: Evan F
authors.initials: EF
authors.lastname: Risko
authors.forename: Chris
authors.initials: C
authors.lastname: Blais
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Stolz
authors.forename: Derek
authors.initials: D
authors.lastname: Besner
mesh_terms: D001288:Attention; D003118:Color Perception; D003463:Cues; D006801:Humans; D007266:Inhibition, Psychological; D009949:Orientation; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation; D011597:Psychomotor Performance; D011601:Psychophysics; D011930:Reaction Time; D012107:Research Design; D012660:Semantics; D013028:Space Perception; D013647:Task Performance and Analysis; D014705:Verbal Behavior