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Recording sites through visual Area 21. Schematic (far right) of the lateral view of the ferret cortex shows the levels (anterior-left to posterior-right) from which the coronal sections containing 19 recording penetrations were taken. Along a given penetration, each dash indicates a recording site where visual neurons were found and tested using qualitative and quantitative single- and combined-modality sensory stimulation. LS, lateral sulcus. Scale bar = 1 mm.
