Cerebral dysfunction

Question 1

Dysfunction involving which of the following areas would most likely result in disinhibition?

Answer 1

Frontal lobe lesions exhibit lateralisation with respect to psychiatric or behavioural disturbances. Left hemisphere lesions are more likely to be associated with depression, particularly if the lesion involves the dorsolateral portion of prefrontal cortex. By contrast, right hemisphere lesions are associated with impulsivity, disinhibition, and aggression.

Question 2

Frontal lobe

Answer 2

Features of dysfunctionContralateral hemiplegia, impaired problem solving, disinhibition, lack of initiative, Broca’s aphasia and agraphia (dominant)

Question 3

Temporal lobe

Answer 3

LobeTemporal

Features of dysfunctionWernicke’s aphasia (dominant), homonymous upper quadrantanopia, auditory agnosia (non-dominant)

Question 4

Parietal lobe (non dominant)

Answer 4

Features of dysfunctionAnosognosia, dressing apraxia, spatial neglect, constructional apraxia

Question 5

Parietal lobe (dominant)

Answer 5

Features of dysfunctionGerstmann’s syndrome

Question 6

Occipital lobe

Answer 6

Features of dysfunctionVisual agnosia, visual illusions, contralateral homonymous hemianopia