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Visual selective attention is a brain function that controls the processing of retinal input based on whether it is relevant or important. It selects particular representations to enter perceptual awareness and therefore guide behaviour. [1] Through this process, less relevant information is suppressed.
Visual agnosia is an impairment in recognition of visually ... This means that there is an impairment in associating the perception of objects with the stored ...
Agnosias are sensory modality specific, usually classified as visual, auditory, or tactile. [2] [3] Associative visual agnosia refers to a subtype of visual agnosia, which was labeled by Lissauer (1890), as an inability to connect the visual percept (mental representation of something being perceived through the senses) with its related semantic information stored in memory, such as, its name ...
These areas play a critical role in processing auditory, visual, and emotional information, as well as memory — functions that are among the first to decline in the early stages of dementia.
If there is a unilateral lesion to area V4, a loss of color perception in only half of the visual field may result known as hemiachromatopsia. [3] Similar, but distinct, is color agnosia , which involves having difficulty recognizing colors, while still being able to perceive them as measured by a color matching or categorizing task.
Visual apperceptive agnosia is a visual impairment that results in a patient's inability to name objects. [9] While agnosics suffer from severe deficits, patients' visual acuity and other visual abilities such as perceiving parts and colours remain intact. [6] Deficits seem to occur because of damage to early-level perceptual processing. [9]
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