Figure 3From: Electrical neuroimaging evidence that spatial frequency-based selective attention affects V1 activity as early as 40-60 ms in humansGrand-average ERPs averaged across all subjects and recorded at POz mesial occipital site in response to targets (L+F+) and gratings of the irrelevant frequency falling at the relevant location (L+F-), separately for each quadrant of visual field and gratings spatial frequency.Back to article page