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Checkerboard-evoked SSVEP amplitudes assessed via FFTs for Experiment 2. FFT amplitude spectra are averaged across a cluster of four occipitoparietal electrodes and all color combinations. Frequency spikes are located at the fundamental checkerboard frequencies and the search array harmonics. Error boxes represent within-subjects SE. a, 7.6 Hz amplitudes. b, 13.3 Hz amplitudes. c, 17.8 Hz amplitudes.
