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Cortical organization in the platypus. Much of the cortex is occupied by the somatosensory areas S1, SR (rostral somatosensory area), and PV. Note the large representations of the bill compared to the body. The small amount of visual cortex is the primary visual area, V1. The auditory cortex (Aud) is also very small. The areal organization of other parts of the neocortex has not been established [based on Krubitzer et al., 1995].
