Crowding is a perceptual phenomenon where the recognition of objects presented away from the fovea is impaired by the presence of other neighbouring objects (sometimes called "flankers"). It has been suggested that crowding occurs due to mandatory integration of the crowded objects by a texture-processing neural mechanism. It is considered a kind of grouping since it is "a form of integration over space as target features are spuriously combined with flanker features."
Crowding deficits have been specifically found in neuropsychiatric disorders such as schizophrenia and autism and may have clinical implications in these disorders. It also suggested that head injuries can cause a crowding effect.
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