Langton, S., O'Malley, C., & Bruce, V. (1996). Actions Speak No Louder Than Words: Symmetrical Cross-Modal Interference Effects in the Processing of Verbal and Gestural Information. Journal of Experimental Psychology: Human Perception and Performance, 22(6), 1357-1375. https://doi.org/10.1037/0096-1523.22.6.1357