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Mean amplitudes of SSVEPs to the different stimulus sequences in VGPs and NVGPs. A, Attended and unattended amplitudes to peripheral sequences (8.6 and 12 Hz combined); SSVEPs to the unattended letter sequences were suppressed to a greater extent in VGPs than in NVGPs. B, SSVEPs to central (5.5 Hz) stimuli were similarly increased by attention in the two groups. C, SSVEPs to the always irrelevant 15 Hz letter sequence in the upper field did not differ between groups.
