Imaging cortical correlates of illusion in the visual cortex
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The first frames show a rapid spread of low amplitude activity (light blue, green, yellow) followed by:

High-level activity (red, brown) that gradually propagates towards the end of the cortical bar representation thus reporting motion within the stationary flashed bar.

A drawn bar or a moving square at appropriate speed produce similar spatio-temporal patterns to that observed here with the line-motion stationary stimuli.
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                                         Optically detected activity within 5.5 x 2.9 mm cortical surface (sampling rate 9.6 ms)