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Stimulation with different spatial frequencies causes different activity patterns. A–H, Iso-orientation maps obtained after stimulation with oriented gratings at a low (0.2 cycles/degree) and a high (0.6 cycles/degree) spatial frequency. At a given orientation the low and high spatial frequency maps are similar, but not identical (see outlines from the map inC, copied to the map in G).I, Cortical blood vessel pattern. Scale bar, 1 mm.
