Related Experiment Video
Updated: Aug 30, 2026

The Crossmodal Congruency Task as a Means to Obtain an Objective Behavioral Measure in the Rubber Hand Illusion Paradigm
Published on: July 26, 2013
On doing two things at once: III. Confirmation of perfect timesharing when simultaneous tasks are ideomotor
1U Washington, Dept of Psychology, Seattle, WA, USA. agg@u.washington.edu
Abstract:
A. G. Greenwald and H. G. Shulman (see record 1974-10326-001) found that 2 tasks characterized by ideomotor (IM) compatibility could be perfectly timeshared (i.e., performed simultaneously without mutual interference). The 2 tasks were pronouncing "A" or "B" in response to hearing those letter names, and making a manual left or right response to seeing a left- or right-positioned arrow. M.-C. Lien, R. W. Proctor, and P. A. Allen (2002) did not replicate Greenwald and Shulman's result, and concluded that their finding of perfect timesharing of 2 IM-compatible tasks might not be replicable. In the present research, Experiment 1 replicated Greenwald and Shulman's 1973 finding while also supporting the conclusion that Lien et al's nonreplication was due to their not instructing subjects to make 2 responses simultaneously in their timeshared task. Experiment 2 again replicated the perfect timesharing finding, using an alternative control procedure that mixed manual and vocal tasks in the same block. ((c) 2003 APA, all rights reserved)
Related Concept Videos
Impression Management Techniques III: Aligning Actions
Muscle Coordination and Action
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement.
Hierarchy of Motor Control
Nonconscious Mimicry
Parallel Processing
