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. Author manuscript; available in PMC: 2014 Apr 1.
Published in final edited form as: Neuroimage. 2012 Nov 28;69:10.1016/j.neuroimage.2012.11.023. doi: 10.1016/j.neuroimage.2012.11.023

Figure 5. Source Estimations of Contour-Related Effects.

Figure 5

Group-averaged LAURA distributed linear source estimations were calculated for the ERP waveforms over the N1 (165-193 msec) time period (panel A and C) and the Ncl (315-350 msec) time period (panel B). No topographic divergence was observed in the N1 time-period, with both conditions showing similar intracranial generators. Thus, only a single source estimation is presented for each stimulus location. Panel A depicts strong contributions from inferior occipital gyrus (left side presentation) and middle temporal gyrus (right side presentation) in this time period. The center panel displays the ventral view (R= right side, L=left side). Panel B depicts topographies for contour-present (CON) and contour-absent (NOCON) conditions separately because there was a significant contour-related topographic divergence during the Ncl time-period. Distributed source activations were observed over the occipital and temporal regions (see Table I for specific details). Panel C depicts source estimations derived from the subtraction waves between the NOCON and CON conditions. The strong contributions from LOC to differential processing are evident in this timeframe, and there is also evidence of potential feedback modulations in hierarchically earlier visual sensory regions.