VISUAL PERCEPTION (TYPES (Language perception (expressive, receptive),…
WHAT IS IT?
Involves memory of past experiences, motivation, expectations, selection of sensory information and active search for pertinent sensory information
Thalamic & cortical involvement
The mechanism by which the brain interprets and attaches meaning to sensory information from the external environment.
Perceived information is further processed by various cognitive functions
Tactile, proprioceptive, vestibular and visual perception provide an internalised sense of body scheme which is basic to motor function
The process of interpreting visual input is a learned skill
CAUSES OF PERCEPTUAL DIFFICULTIES
Trauma, Tumours, Infection, Vascular disease, Toxins, Anoxia, Mental health disorders, Neurological conditions, Neurodegenerative conditions and Developmental disorders
Sensory areas send information to association areas which integrates information from all the areas to form a sensory experience.
Sensory areas: somatosensory association cortex, auditory cortex, visual cortex, motor cortex, olfactory and gustatory cortex.
Association areas: posterior association area located in the posterior of brain where parietal, occipital and temporal lobes meet.
Information sent to anterior association area in prefrontal cortex (storage area for motor plans) which sends information to premotor area.
Anterior association area: uses data to make decisions about which motor plan to implement
Premotor area access chosen motor plan.
Premotor area sends motor plan to primary motor cortex which implements the motor plan.
Right hemisphere damage
Perceptual impairment most frequently involves damage to the posterior multimodal area
Language perception (expressive, receptive)
Motor planning perception (praxis)
Body schema perception
To identify need for referral for more extensive neuropsychological assessment
Essential to develop appropriate discharge plan which should include safety
Influence on diagnosis and rehabilitation potential
Essential to develop appropriate Rx plan which should be guided by the client’s learning potential
VISUAL LINKS WITH MOTOR CONTROL
Visuospatial processing – e.g. eye movements are essential
Assists the somesthetic system in forming motor engrams
Affects motor learning and praxis
Visual feedback affects motor control
Spatial components to movement