“…Empirically, this asymmetry in coupling strength was evidenced by demonstrations that both spontaneous, frequency-induced (Byblow et al, 1994;Byblow, Chua, & Goodman, 1995;De Poel et al, in press) and voluntary (Carson, Byblow, Abernethy, & Summers, 1996;De Poel et al, 2006) switches between coordination patterns were mediated predominantly by changes in the phasing of the ND limb and by the observation that the phasing of the ND limb was more strongly influenced by a mechanical perturbation of the contralateral (D) limb than the D limb's phasing was in response to a perturbation of the contralateral (ND) limb (De Poel et al, in press). 1 Interestingly, previous studies revealed that the observed phase lead of the D limb could be modulated by means of attention: When attention was focused on the movements of the D (ND) limb, the phase lead of the D limb increased (decreased) Franz, 2004;Pellegrini, Andrade, & Teixeira, 2004;Riley, Amazeen, Amazeen, Treffner, & Turvey, 1997;Swinnen et al, 1996). Moreover, such an asymmetry in attentional focus affected the stability of bimanual performance, in that focusing on the D limb resulted in enhanced coordinative stability Swinnen et al, 1996).…”