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Fig. 9.4. Postnatal orientation maps in animals and in HLISSOM. (a) A 5 mm × 5 mm area of the orientation preference map in adult macaque (detail of Figure 2.4a, reprinted with permission from Blasdel 1992b, copyright 1992 by the Society for Neuroscience). After postnatal training on natural images, the HLISSOM map (b) replicates its structure very well. Thus, the HLISSOM model shows how both the prenatal and adult orientation maps can develop based on internally generated and environmental stimuli.