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Utilisation Behaviour – Frontal Disinhibition — SCE Neurology MCQ

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HardCerebrovascular DiseaseUtilisation Behaviour – Frontal DisinhibitionSCE Neurology

A 60-year-old man with a right frontal lobe stroke develops utilisation behaviour — he automatically picks up and uses objects placed in front of him (puts on glasses that are not his, picks up a pen and starts writing) without being asked. He cannot inhibit these responses. What does this represent?

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Correct answer: B — Frontal lobe disinhibition — utilisation behaviour reflects loss of frontal executive control over automatic stimulus-driven (environmental dependency) responses to objects

Utilisation behaviour is a type of environmental dependency syndrome caused by frontal lobe (particularly medial frontal/supplementary motor area) damage. Normal behaviour involves inhibiting automatic motor responses to objects in the environment. With frontal lobe damage, this inhibition is lost — the patient automatically grasps and uses objects that are presented to them, driven by the visual affordance of the object (a pen affords writing, glasses afford wearing). It is part of the spectrum of frontal disinhibition along with imitation behaviour, motor perseveration, and stimulus-bound behaviour. A: Inappropriate automatic use of objects is pathological. C: OCD involves intrusive thoughts and compulsive rituals. D: No EEG correlate. E: Apraxia is inability to perform actions on command.

Reference: Clinical Neuroanatomy; Lhermitte Utilisation Behaviour