Figure 1

Overview of grand average ERP data. (a)  The grand average ERP waveforms in example electrodes Cz and Oz. Two clear peaks were observed across almost all electrodes following motion onset: an early peak around 160–220 ms and a later peak around 260–300 ms. LC = left-handers coherent, LI = left-handers incoherent, RC = right-handers coherent, RI = right-handers incoherent. (b)  Presents a topography of the mean amplitude values that were obtained in the early and late windows in the coherent and incoherent conditions, for left- and right-handers respectively. In both conditions, the early window was characterised by a pattern of fronto-central negativity (blue) and parieto-occipital positivity (red). This pattern reversed in the later window, with frontal positivity and parieto-occipital negativity in the coherent condition and a more central positivity with surrounding negativity in the incoherent condition. In general, larger amplitudes were observed in the incoherent condition and amongst the left-hander group.