Parietal Lobe
The parietal lobe contain the primary sensory cortex which controls sensation (touch, pressure. Behind the primary sensory cortex is a large association area that controls fine sensation (judgment of texture, weight, size, shape). There are Parietal Lobes on the left and right sides
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Right - Damage to this area can cause visuo-spatial deficits (you may have difficulty finding your way around new, or even familiar, places or neglect, do not recognize anything on your affected left side)
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Left - Damage to this area may disrupt a patient’s ability to understand spoken and/or written language
Somatosensory Disturbances
Somatoperceptual Disorders
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Astereognosis (“stereo” = “solid” in Greek) - inability to recognize objects by touch
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Simultaneous extinction - failure to attend to stimuli presented at the same time
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Asomatognosia: loss of a sense of one's own body including
- Anosognosia: denial or lack of knowledge of illness or impairment
- Anosodiaphoria: indifference toward illness
- Finger agnosia: inability to point to or identify fingers upon stimulation
Blaint's Syndrome
- Inability to fixate on distinct visual stimuli despite ability to move eyes
- Simultagnosia - attention limited to one object at a time
- Optic Ataxia - difficulty reaching for objects under visual guidance
Right Parietal Lesions
- Neglect for contralateral (left) side of body
- Neglect for visual stimuli in left visual field
- Impairment in object recognition in unfamiliar views or positions
Left Parietal Lesions
- Gerstmann Syndrome
- Finger Agnosia
- Right-left confusion
- Agraphia (inability to write)
- Acalculia (inability to do arithmetic)
- Other disturbances may include
- Dyslexia
- Dysphasia (errors in grammar)
- Apraxia (loss of a skilled movement)
Drawing - Multiple forms of error ranging from entire drawing to individual details
Spatial Cognition - Ability to manipulate spatial objects mentally may be impaired, e.g., map reading
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