Fig. 4: Source activity underlying the Nt at different hierarchical levels in the visual cortex. | Communications Biology

Fig. 4: Source activity underlying the Nt at different hierarchical levels in the visual cortex.

From: Parallel fast and slow recurrent cortical processing mediates target and distractor selection in visual search

Fig. 4

a The source waves represent the current density reconstructions (CDR) in the shown regions of interest (ROIs, collapsed over regions in the left and right hemisphere) with the corresponding coloration. The response maximum in V1 (red) appears with a delay relative to the higher-level (blue, IT) and mid-level ROIs (brown, VO/V4), but notably prior to the maximum in lower-level areas (green, V2/3). The colored numbers indicate the time point (ms) at which the source strength in the corresponding ROIs reached 50% of the maximum CDR in the analyzed time range. b Event-related magnetic field (ERMF) response elicited by the target at occipital-central sensors (inset) reflecting activity in V1 for fast (solid) and slow (dashed) correct responses (median split). c Correlation (across n = 24 subjects) of the response time difference between fast and slow responses and the corresponding amplitude difference at the occipital sensors shown in (b).

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