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Utilisation behaviour consequent to bilateral SMA softening.
Edoardo Boccardi1, Sergio Della Sala, Cristina Motto
1Servizio di Neuroradiologia, Azienda Ospedaliera, Niguarda-Ca' Granda, Milan, Italy.
Summary
This study reports on a patient with utilization behavior due to a rare stroke affecting the supplementary motor areas. The findings suggest this behavior stems from an imbalance in frontal lobe functions, not previously understood.
Area of Science:
- Neuroscience
- Neurology
- Cognitive Science
Background:
- Utilization behavior is a complex neurological condition.
- Previous theories linked it to fronto-parietal dysfunction.
- Patient CU presented with severe utilization behavior without typical frontal lobe signs.
Observation:
- Patient CU experienced a bilateral stroke in the anterior cerebral artery territory.
- A unique arterial variant led to a symmetrical parasagittal lesion affecting supplementary motor areas (Brodmann's area 6).
- Premotor cortices, corpus callosum, and cingulate gyri remained largely undamaged.
Findings:
- The lesion specifically damaged the supplementary motor areas, crucial for action modulation and inhibition.
- This damage created an imbalance, leaving the patient susceptible to environmental stimuli.
- Utilization behavior is hypothesized as a 'double anarchic hand' resulting from this intra-frontal imbalance.
Implications:
- This intra-frontal hypothesis offers a novel explanation for utilization behavior.
- It refines our understanding of the roles of premotor and supplementary motor areas in action control.
- The findings challenge existing fronto-parietal models of utilization behavior.