Figure 1. Rhythmic theta activity in V1 and V4 in response to the Kanizsa illusion.
(A) Depiction of the Kanizsa illusion (upper panel) and the control stimulus (lower panel).
(B) Upper panel: example V1 MUA response from one representative electrode channel; lower panel: MUA powerspectrum for area V1 averaged across channels from monkey K. Kanizsa (red) and control conditions (gray), shaded areas depict SEM.
(C) Same as (B) but for V4 (monkey B).
(D) Time-frequency representations of V1 LFP, averaged across channels from monkey K for the Kanizsa condition for low (lower panel) and high frequencies (top panel). Low and high frequencies are displayed separately due to the large increase in the theta range.
(E) Same as (D) but V4 (monkey B).