Feature Detectors
Feature detectors are specialized neurons, primarily located in the visual cortex, that respond to specific stimulus features such as shape, angle, or movement. The concept was significantly advanced by the research of David Hubel and Torsten Wiesel, who discovered that certain cells in the visual cortex of cats were specifically activated by lines of a particular orientation.
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Pandemonium model (visual perception)
An individual suffers a very specific brain injury affecting a small cluster of cells in their visual processing center. As a result, they can perceive colors, shapes, and motion without issue, but they are completely unable to perceive any lines that are oriented vertically. Their ability to see horizontal and diagonal lines remains perfectly intact. This highly specific deficit is best explained by damage to: