Abnormal tactile temporal discrimination in psychogenic dystonia.
Neurology
; 77(12): 1191-7, 2011 Sep 20.
Article
en En
| MEDLINE
| ID: mdl-21900627
ABSTRACT
OBJECTIVE:
Neurophysiologic studies demonstrated that patients with primary torsion dystonia (PTD) and with psychogenic dystonia (Psy-D) share similar abnormalities in the motor system. In this study, we evaluated somatosensory function in Psy-D by testing temporal discrimination threshold (TDT), and compared the results with those obtained in patients with PTD.METHODS:
TDT of tactile stimuli was assessed in 10 patients with Psy-D, 10 patients with PTD, and 16 control subjects. The 2 groups of patients were matched for age, gender, disease duration, and distribution of dystonia. Tactile stimuli consisted of pairs of non-noxious electrical shocks delivered to the right or left hand at interstimulus interval increasing from 0 to 400 msec, in 10-msec steps. TDT was defined as the value at which subjects recognized the 2 stimuli as asynchronous.RESULTS:
TDT was higher in Psy-D and PTD compared to control subjects, for both the right and the left hand. In a subgroup of patients with unilateral dystonia (Psy-D = 4, PTD = 5), TDT did not differ between the affected and the unaffected side in both groups of patients. Disease duration was not correlated to the increased TDT value.CONCLUSIONS:
Our study suggests an impaired processing of somatosensory inputs in both Psy-D and PTD. These abnormalities might represent a neurophysiological trait predisposing to develop a dystonic posture triggered by psychiatric and psychological factors.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Umbral Sensorial
/
Percepción del Tiempo
/
Tacto
/
Trastornos Distónicos
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Discriminación en Psicología
Tipo de estudio:
Clinical_trials
/
Diagnostic_studies
/
Prognostic_studies
Límite:
Adult
/
Female
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Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Neurology
Año:
2011
Tipo del documento:
Article
País de afiliación:
Italia