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Tactile Semiautomatic Passive-Finger Angle Stimulator (TSPAS)
Published on: July 30, 2020
Tactile temporal discrimination in patients with blepharospasm.
M Fiorio1, M Tinazzi, A Scontrini
1Dipartimento di Scienze Neurologiche e della Visione, Sez. Neurologia Riabilitativa, Universitè di Verona, Via Casorati 43, 37131 Verona, Italy. mirta.fiorio@medicina.univr.it
Journal of Neurology, Neurosurgery, and Psychiatry
|November 8, 2007
Summary
Patients with blepharospasm show impaired temporal processing, indicating central nervous system deficits. This contrasts with hemifacial spasm patients, suggesting distinct neurological mechanisms in focal dystonias.
Area of Science:
- Neuroscience
- Sensory Neuroscience
- Movement Disorders
Background:
- Blepharospasm is an adult-onset focal dystonia characterized by involuntary blinking and eyelid spasms.
- Sensory deficits have been previously observed in individuals with dystonia.
Purpose of the Study:
- To investigate the impact of muscle spasms on sensory performance in blepharospasm and hemifacial spasm.
- To differentiate between central and peripheral sensory processing abnormalities in these conditions.
Main Methods:
- Temporal discrimination threshold (TDT) was measured in 19 blepharospasm patients, 19 hemifacial spasm patients, and 19 controls.
- Tactile stimuli were applied to the hands and the orbicularis oculi muscle region, assessing the ability to distinguish simultaneous from sequential stimuli.
Main Results:
- Patients with blepharospasm exhibited significantly higher TDTs compared to controls and hemifacial spasm patients.
- This impairment in temporal processing was observed irrespective of stimulus location (hand or face).
- Hemifacial spasm patients showed TDTs comparable to control subjects.
Conclusions:
- The observed TDT deficits in blepharospasm are attributed to central, rather than peripheral, factors.
- This finding supports a link between focal dystonia, specifically blepharospasm, and disruptions in central somatosensory temporal processing.
- The results suggest distinct underlying mechanisms for blepharospasm and hemifacial spasm regarding sensory integration.
