Paradoxical kinesia may no longer be a paradox waiting for 100 years to be unraveled.
Level 5 - mechanism / opinion, no new human data
Narrative review and mechanistic animal research with no human clinical trial data.
PubMed 36933238 · doi:10.1515/revneuro-2023-0010
What was done
The authors reviewed historical concepts and mechanistic hypotheses of paradoxical kinesia in Parkinson's disease, reporting results from two animal models they established to explore neural pathways, specifically focusing on the inferior colliculus, intracollicular electrical deep brain stimulation, and glutamatergic and GABAergic neurotransmission.
What was found
No quantitative findings, sample sizes, or effect sizes are reported in the abstract. Qualitatively, findings from the animal models implicated the inferior colliculus as a key structure in paradoxical kinesia, suggesting it may serve as an alternative pathway that bypasses the basal ganglia during urgent or emotionally driven motor responses.
Why it matters
Understanding the neural circuitry of paradoxical kinesia provides insight into how Parkinsonian akinesia is transiently overridden and highlights the inferior colliculus as a potential target for deep brain stimulation.
Limits
The abstract describes preclinical animal research and a narrative review with no human clinical trial data. No quantitative metrics, sample sizes, or experimental details are reported in the abstract, and mechanisms identified in animal models may not fully translate to human Parkinson's disease.
Cited by
- supports Individuals with Parkinson's disease experiencing akinesia or bradykinesia can suddenly execute rapid movements, such as running out of a burning house, when faced with an urgent emergency (kinesia paradoxa).