PSYC 301 Disorders of Visual and Spatial Perception

Hemianopsia

Visual field deficit

Dorsal stream of vision

The where pathway/occipito-parietal; location, movement, and spatial relations

Ventral stream of vision

The what pathway/occipito-temporal; colour, texture, shape, and size

Visual object agnostic

Impairment in the recognition of visual objects; apperception or asssociative

Apperceptive visual agnosia

An inability to produce a whole concept of an object; cannot copy or match objects

Associative visual agnosia

An inability to produce a whole concept of an object; can draw a copy of an object and can match two similar objects

Prosopagnosia

"Face blindness"; deficit in identifying faces but can recognize prominent features of a face

Topographagnosia

"Place blindness"; the inability to find one's way through an environment

Simultanagnosia

Impairment in the ability to see more than one object in a scene at a time or appreciate multiple aspects of a single object

Cortical blindness

Loss of perceived vision caused by bilateral damage posterior to the lateral geniculate nucleus; normal pupillary light reflexes and will not walk into objects that are placed in front of them

Neglect

An attentional issue- failure to report, respond, or orient stimuli on one side (usually the left); acts as though one side of space does not exist