Form perception is the recognition of visual elements of objects, specifically those to do with shapes, patterns and previously identified important characteristics.
Visual information continues to be processed in the posterior parietal cortex, also known as the dorsal stream, where the representation of an object’s shape is formed using motion-based cues.
It is believed that simultaneously information is processed in the anterior temporal cortex, also known as the ventral stream, where object recognition, identification and naming occur.
Observed latency in activation of different parts of the brain supports the idea of hierarchal processing of visual stimuli, with object representations progressing from simple to complex.
[5] By five months of age infants are capable of using line junction information to perceive three-D images, including depth and shape, like adults are able.
[7] Visual information then continues to be processed in the posterior parietal cortex, also known as the dorsal stream, where the representation of an objects shape is formed using motion-based cues.
[8] Dysfunctions in distinguishing differences in sizes and shapes of objects can have many causes, including brain injury, stroke, epilepsy, and oxygen deprivation.
Regions that specifically lead to deficits in object recognition when a lesion is present include the right lateral fusiform gyrus and the ventrolateral occipito-temporal cortex.
After identifying the specific visual problem that exists, intervention can include eye exercises, work with computer programs, neurotherapy, physical activities, and academic adjustments.
When patients have lesions on their brain that develop as a result of injury or illness, such as multiple sclerosis or epilepsy, it is possible that they may have impaired object recognition which can manifest in the form of many different agnosias.
[12] Regions that specifically lead to deficits in object recognition when a lesion is present include the right lateral fusiform gyrus and the ventrolateral or ventromedial occipito-temporal cortex.