Parietal lobe lesions

y These may be associated with:

Contralateral cortical sensory loss, involving joint position sense, two point discri-

g mination, stereognosis or form recognition (appreciation of shape, size, weight y and texture) and graphaesthesia. Dominant hemisphere lesions: communication disorders, or aphasia. Non-dominant hemisphere lesions: contralateral hemi-spatial neglect and failure to acknowledge the existence of deficits (anosognosia). Visuospatial abnormalities.

Gerstmann's syndrome (lesion in the left angular gyrus): dyscalculia, dysgraphia, finger agnosia, right-left disorientation. Agnosia: a disorder of awareness in the presence of normal sensation, vision and motor function.

Apraxia: a disorder of co-ordinated motor activity in the absence of motor or sensory loss.

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