Cover Picture: Relationship between the rate of change of orientation and direction preferences in the primary visual cortex of the cat. Red lines indicate iso-orientation lines along which orientation preference does not change. Dark blue marks regions where orientation preference changes rapidly. The strongest changes are found at the so-called orientation centres from which iso-orientation lines radiate out in a pinwheel-like fashion. Light blue denotes direction fracture lines across which direction preference shows 180ƒ reversals. Note that direction fracture lines run parallel with iso-orientation lines for the most part of the map, although instances for their orthogonal relationship are also seen. Image size: 2.7 × 2.1 mm2 of cortex. See Kisv·rday et al., 636-647.
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