Increasing task difficulty enhances effects of intersensory redundancy: testing a new prediction of the Intersensory Redundancy Hypothesis.
Bahrick LE, Lickliter R, Castellanos I, Vaillant-Molina M. Increasing task difficulty enhances effects of intersensory redundancy: testing a new prediction of the Intersensory Redundancy Hypothesis. Dev Sci. 2010 Sep 01; 13(5):731-7.