The estimated magnitude of the IHTT did not differ significantly between the four electrode pairs for either P1 (average 10 ms, ranging from 14 ms to 24 ms) or N1 (average 15 ms, with a range of 14 to 17 ms) (see Figs. 6 and 7). These estimates are similar to the IHTTs reported for both P1 (Saron and Davidson, 1989) and N1 (Moes et al., 2007; Saron and Davidson, 1989) in previous ERP studies, illustrating the reliability of the basic approach. Our finding of asymmetric IHTTs to in response to LVF as opposed to RVF stimuli has been reported in several previous ERP studies, although the direction of these asymmetries has been inconsistent. For example, while Nowicka, Grabowska and Fersten (1996) reported faster transfer from left-to-right hemisphere to visual gratings (consistent with the results of the present study), both Saron and Davidson (1989) and (Patston et al., 2007) observed faster transfer from right-to-left hemisphere for similar stimuli. The microstructural underpinnings of these IHTT asymmetries are unclear and represent a point of contention in the literature. Marzi (1991), for example,
