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Attention-related activity was retinotopically specific. Bars, estimated amplitudes of sustained delay-period activity. Error bars, standard errors of the mean across trials. Response amplitudes were significantly greater than zero in the portions of each visual area corresponding to the attended visual field for 3 of the 4 subjects. Response amplitudes corresponding to unattended visual field were negative for all 4 subjects. ns = not significant; * = p < 0.05; ** = p < 10−4.
