Perception & Perceptual Deficits

What is a lack of awareness or ↓ awareness of sensory stimulation on contralesional side of body OR space/enviro?

Often unaware of deficit & indifferent to that side of body.

NOT due to sensory or motor loss. Can occur if vision is intact or impaired

R hemisphere lesions > L hemisphere lesions. Often occurs w/ posterior parietal or thalamic lesions

unilateral spatial inattention (can be called ‘neglect’)

What is a lack of awareness or denial of a paretic extremity?

Lack of insight concerning paralysis/disability

anosognosia

what is an impairment in body scheme→ lack of awareness of structure of body & relationship of body parts to oneself or to others?

Lack of proprioception can compound, Lesions often in parietal lobe

Difficulty w/ activities related to following instruction for mvmt during transfers, dressing, exercise

Somatoagnosia/Body Agnosia

what is the inability to identify L & R sides of one’s body or body of examiner?

Lesions often in parietal lobe

Right-Left Discrimination

what is the inability to visually distinguish a figure from its embedded background?

Difficulty determining end of stair on descent

Lesions often in parieto-occipital region

Figure-Ground Discrimination

what is difficulty understanding/remembering relationship between locations?

Lesions often in parietal cortex

Topographical Disorientation

What is an inaccurate judgement of direction, distance, & depth?

Clinically, may have difficulty navigating stairs or miss chair on attempt to sit

Lesions often in posterior R hemisphere

Depth & Distance Perception

What is an inability to recognize familiar objects despite normal vision?

Cannot visually identify an object, but can identify once using another sense

Lesions often in occipito-temporal cortex

visual agnosia

What is an impairment of voluntary, skilled, learned mvmts which is not due to strength, coordination, sensation, attention, cognitive, or behavioral deficits?

apraxia

What is the breakdown b/t concept (Idea of mvmt) & performance (execution of mvmt)?

Cannot perform task on command BUT can perform spontaneously

Lesions often in frontal or posterior parietal lobes

Ideomotor Apraxia

What is failure to conceptualize a task?

Cannot perform task automatically OR on command

Lesions often in parietal lobe

Ideational Apraxia