As illustrated in Figs. 6b and 7b, there were no significant differences between the SZ and HC participants in terms of their IHTTs. Furthermore, there were no significant Diagnosis × VF × Hemisphere interactions, indicating that both groups exhibited a similar pattern of asymmetric IHTTs (i.e., faster left-to-right transfer, as discussed above). This result is inconsistent with the findings of the three previous studies (to our knowledge) that have used ERPs to investigate for IHTT abnormalities to unilaterally-presented visual stimuli in patients with SZ (Barnett et al., 2005; Barnett and Kirk, 2005; Endrass et al., 2002). Specifically, all three of these studies reported that while right-to-left transfer was faster than left-to-right in HCs, this asymmetry in IHTT was not present in schizophrenia patients. It should be noted, however, that there were substantial methodological differences between the present study and these three previous studies which could have contributed to the conflicting results.
