Article

Visual agnosia encompasses all disorders of visual recognition within a selective
visual modality not due to an impairment of elementary visual processing or other
cognitive deficit. Based on a sequential dichotomy between the perceptual and
memory systems, two different categories of visual object agnosia are usually
considered: 'apperceptive agnosia' and 'associative agnosia'. Impaired visual
recognition within a single category of stimuli is also reported in: (i) visual
object agnosia of the ventral pathway, such as prosopagnosia (for faces), pure
alexia (for words), or topographagnosia (for landmarks); (ii) visual spatial
agnosia of the dorsal pathway, such as cerebral akinetopsia (for movement), or
orientation agnosia (for the placement of objects in space). Focal brain injuries
provide a unique opportunity to better understand regional brain function,
particularly with the use of effective statistical approaches such as voxel-based
lesion-symptom mapping (VLSM). The aim of the present work was twofold: (i) to
review the various agnosia categories according to the traditional visual
dual-pathway model; and (ii) to better assess the anatomical network underlying
visual recognition through lesion-mapping studies correlating neuroanatomical and
clinical outcomes.
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Langue : ANGLAIS