title: Simultaneous dual-task performance reveals parallel response selection after practice.
abstract: E. H. Schumacher, T. L. Seymour, J. M. Glass, D. E. Kieras, and D. E. Meyer (2001) reported that dual-task costs are minimal when participants are practiced and give the 2 tasks equal emphasis. The present research examined whether such findings are compatible with the operation of an efficient response selection bottleneck. Participants trained until they were able to perform both tasks simultaneously without interference. Novel stimulus pairs produced no reaction time costs, arguing against the development of compound stimulus-response associations (Experiment 1). Manipulating the relative onsets (Experiments 2 and 4) and durations (Experiments 3 and 4) of response selection processes did not lead to dual-task costs. The results indicate that the 2 tasks did not share a bottleneck after practice.
authors.affiliation: National Aeronautics and Space Administration (NASA) Ames Research Center, Moffett Field, California 94035, USA. ehazeltine@mail.arc.nasa.gov
authors.forename: Eliot
authors.initials: E
authors.lastname: Hazeltine
authors.forename: Donald
authors.initials: D
authors.lastname: Teague
authors.forename: Richard B
authors.initials: RB
authors.lastname: Ivry
mesh_terms: D001288:Attention; D006801:Humans; D009949:Orientation; D010364:Pattern Recognition, Visual; D010898:Pitch Perception; D011214:Practice, Psychological; D011597:Psychomotor Performance; D011601:Psychophysics; D011930:Reaction Time; D012033:Refractory Period, Psychological; D014705:Verbal Behavior