Table 1.

salient characteristics of empirically measured C1 component topographies (Di Russo et al., 2002) listed alongside corresponding characteristics of the V1, V2 and V3 topographies simulated by Ales et al. (2013), assuming surface-negative cortical activation.

	Polarity or the scalp		Topographic focus
	Upper field stimuli	Lower field stimuli	Upper field stimuli	Lower field stimuli
Empirical C1 (Di Russo et al 2002)	negative	positive	slightly ipsilateral	contralateral
Simulated V1	negative	positive	slightly ipsilateral	contralateral
Simulated V2	positive	negative	contralateral	slightly contralateral
Simulated V3	positive	negative	contralateral	slightly contralateral