Effect of illusory-contour stimulation on early frontal components on VEPs

[Speaker] Hayakawa, Tomoe:1
[Co-author] Takahashi, Kouki:1
1:Teikyo University (Japan)

The human visual system can automatically complement discontinuous boundaries. EEG studies of the neural substrate of visual completion using illusory contour (IC) stimuli have found evidence of large negative activity in the lateral occipital complex at latencies of 100-200 ms under the IC condition. However, it is still not known whether activity in the frontal cortex[KA1] is involved in global image processing. Here, we recorded visual evoked potentials using several different IC stimuli. P100, N145, P200 activities over the occipital scalp sites and frontal N80 activity were detected in both the IC and no contour (NC) conditions. The amplitude N80 under the IC condition was significantly larger than that under the NC condition, whereas the P100, N145 and P200 amplitudes showed no differences between conditions. These results suggest that early frontal negativity affects the later processing of visual completion in the occipital cortices.
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