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Following many studies showing that the coupling in bimanual coordination can be perceptual, Bingham (Ecol Psychol in 16:45–53, 2001; 2004a, b) proposed a dynamical model of such movements. The model contains three key hypotheses: (1) Being able to produce stable coordinative movements is a function of the ability to perceive relative phase, (2) the information to perceive relative phase is relative direction of motion, and (3) the ability to resolve this information is conditioned by relative speed. The first two hypotheses have been well supported (Wilson and Bingham in Percept Psychophys 70:465–476, 2008; Wilson et al. in J Exp Psychol Hum 36:1508–1514, 2010a), but the third was not supported when tested by de Rugy et al. (Exp Brain Res 184:269–273, 2008) using a visual coordination task that required simultaneous control of both the amplitude and relative phase of movement. The …