# 05 - Parietal lobe lesions

# Parietal lobe lesions

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B. Lobar lesions 
Frontal lobe lesions 
 
 
 
Parietal lobe lesions 
 
 
 
 
 
Unilateral lesions 
Bilateral lesions 
Contralateral spastic hemiplegia 
Bilateral hemiplegia 
Slight elevation of mood, increased talkativeness, 
tendency to joke inappropriately (Witzelsucht) 
Spastic bulbar (pseudo bulbar) palsy 
Frontal release signs (grasp and suck reflexes) 
Abulia (indecisiveness, lack of drive) 
Anosmia 
Decomposition of gait and sphincter incontinence 
Motor speech disorder with agraphia, with or 
without oro-buccal apraxia (left) 
Varying combinations of grasping, sucking, obligate 
imitative movements, utilization behavior. 
Loss of verbal fluency with perseveration (left) 
 
Specific frontal syndromes (pseudo depressive, dysexecutive and pseudo psychopathic) 
Unilateral lesions 
Bilateral lesions 
Corticosensory syndrome and sensory extinction 
Spatial disorientation & visual spatial defects 
Mild hemiparesis 
Bilateral ideomotor and ideational apraxia (more prominent 
with left-sided lesions) 
Homonymous hemianopia or inferior 
quadrantanopia (incongruent or congruent) 
Tactile agnosia (bimanual astereognosis) (more prominent 
with left sided lesions) 
Neglect of the opposite side of external space 
(right parietal lesions) 
 
Anosognosia, dressing and constructional apraxias (may 
occur with lesions of either hemisphere are more frequent 
and severe with nondominant right lesions) 
Gerstmann syndrome (dysgraphia, dyscalculia, 
finger agnosia, right-left confusion) (left) 
Balint syndrome 
GELASTIC SEIZURE 
 
An epileptic fit of incessant ‘laughter’, not necessarily 
euphoria, is called gelastic seizure. This occurs with 
left prefrontal seizures.