Perceptual learning can be defined as practice-induced improvement in the ability to perform specific perceptual tasks. We previously proposed the Reverse Hierarchy Theory as a unifying concept that links behavioral findings of visual learning with physiological and anatomical data. Essentially, it asserts that learning is a top-down guided process, which begins at high-level areas of the visual system, and when these do not suffice, progresses backwards to the input levels, which have a better signal-to-noise ratio. This simple concept has proved (...) powerful in explaining a broad range of findings, including seemingly contradicting data. We now extend this concept to describe the dynamics of skill acquisition and interpret recent behavioral and electrophysiological findings. (shrink)

was to test the role of both early and higher visual areas in the integration of local features into global shapes. To this end, we conducted functional magnetic resonance imaging studies. Although fMRI lacks the high spatial resolution of intracortical recordings, it allows simultaneous collection of responses to the same stimulus set from multiple visual areas that is not possible with standard recording techniques. We performed these studies in monkeys, where much is known about the properties of neurons in different (...) visual areas, and in humans, where recent fMRI.. (shrink)