Tactile Temporal Discrimination Is Impaired in Myoclonus‐Dystonia

2020 ◽  
Vol 35 (12) ◽  
pp. 2356-2357
Author(s):  
Clément Tarrano ◽  
Jean‐Charles Lamy ◽  
Cécile Delorme ◽  
Eavan M. McGovern ◽  
Cyril Atkinson‐Clement ◽  
...  
Keyword(s):  
Temporal Discrimination ◽  
Myoclonus Dystonia ◽  
Tactile Temporal Discrimination

scholarly journals Impaired Tactile Temporal Discrimination in Patients With Hepatic Encephalopathy

2018 ◽  
Vol 9 ◽  
Author(s):  
Moritz Lazar ◽  
Markus Butz ◽  
Thomas J. Baumgarten ◽  
Nur-Deniz Füllenbach ◽  
Markus S. Jördens ◽  
...  
Keyword(s):  
Hepatic Encephalopathy ◽  
Temporal Discrimination ◽  
Tactile Temporal Discrimination

Tactile and proprioceptive dysfunction differentiates cervical dystonia with and without tremor

Neurology ◽  
2020 ◽  
Vol 94 (6) ◽  
pp. e639-e650 ◽  
Author(s):  
Laura Avanzino ◽  
Amel Cherif ◽  
Oscar Crisafulli ◽  
Federico Carbone ◽  
Jacopo Zenzeri ◽  
...  
Keyword(s):  
Cervical Dystonia ◽  
Feedforward Control ◽  
Temporal Discrimination ◽  
Matching Task ◽  
Proprioceptive Information ◽  
Joint Position ◽  
Body Segments ◽  
Gating Mechanism ◽  
Head Positioning ◽  
Tactile Temporal Discrimination

ObjectiveTo determine whether different phenotypes of cervical dystonia (CD) express different types and levels of somatosensory impairment.MethodsWe assessed somatosensory function in patients with CD with and without tremor (n = 12 each) and in healthy age-matched controls (n = 22) by measuring tactile temporal discrimination thresholds of the nondystonic forearm and proprioceptive acuity in both the dystonic (head/neck) and nondystonic body segments (forearm/hand) using a joint position‐matching task. The head or the wrist was passively displaced along different axes to distinct joint positions by the experimenter or through a robotic exoskeleton. Participants actively reproduced the experienced joint position, and the absolute joint position‐matching error between the target and the reproduced positions served as a marker of proprioceptive acuity.ResultsTactile temporal discrimination thresholds were significantly elevated in both CD subgroups compared to controls. Proprioceptive acuity of both the dystonic and nondystonic body segments was elevated in patients with CD and tremor with respect to both healthy controls and patients with CD without tremor. That is, tactile abnormalities were a shared dysfunction of both CD phenotypes, while proprioceptive dysfunction was observed in patients with CD with tremor.ConclusionsOur findings suggest that the pathophysiology in CD can be characterized by 2 abnormal neural processes: a dysfunctional somatosensory gating mechanism involving the basal ganglia that triggers involuntary muscle spasms and abnormal processing of proprioceptive information within a defective corticocerebellar loop, likely affecting the feedback and feedforward control of head positioning. This dysfunction is expressed mainly in CD with tremor.

Primary somatosensory cortical plasticity and tactile temporal discrimination in focal hand dystonia

2014 ◽  
Vol 125 (3) ◽  
pp. 537-543 ◽  
Author(s):  
Antonella Conte ◽  
Lorenzo Rocchi ◽  
Gina Ferrazzano ◽  
Giorgio Leodori ◽  
Matteo Bologna ◽  
...  
Keyword(s):  
Cortical Plasticity ◽  
Temporal Discrimination ◽  
Focal Hand Dystonia ◽  
Hand Dystonia ◽  
Tactile Temporal Discrimination

scholarly journals Beta oscillations define discrete perceptual cycles in the somatosensory domain

2015 ◽  
Vol 112 (39) ◽  
pp. 12187-12192 ◽  
Author(s):  
Thomas J. Baumgarten ◽  
Alfons Schnitzler ◽  
Joachim Lange
Keyword(s):  
Empirical Evidence ◽  
Discrimination Task ◽  
Sensory Input ◽  
Temporal Discrimination ◽  
Beta Band ◽  
Theoretical Concepts ◽  
Domain Specific ◽  
Discrete Processing ◽  
Visual Domain ◽  
Tactile Temporal Discrimination

Whether seeing a movie, listening to a song, or feeling a breeze on the skin, we coherently experience these stimuli as continuous, seamless percepts. However, there are rare perceptual phenomena that argue against continuous perception but, instead, suggest discrete processing of sensory input. Empirical evidence supporting such a discrete mechanism, however, remains scarce and comes entirely from the visual domain. Here, we demonstrate compelling evidence for discrete perceptual sampling in the somatosensory domain. Using magnetoencephalography (MEG) and a tactile temporal discrimination task in humans, we find that oscillatory alpha- and low beta-band (8–20 Hz) cycles in primary somatosensory cortex represent neurophysiological correlates of discrete perceptual cycles. Our results agree with several theoretical concepts of discrete perceptual sampling and empirical evidence of perceptual cycles in the visual domain. Critically, these results show that discrete perceptual cycles are not domain-specific, and thus restricted to the visual domain, but extend to the somatosensory domain.

Abnormal tactile temporal discrimination in psychogenic dystonia

Neurology ◽  
2011 ◽  
Vol 77 (12) ◽  
pp. 1191-1197 ◽  
Author(s):  
F. Morgante ◽  
M. Tinazzi ◽  
G. Squintani ◽  
D. Martino ◽  
G. Defazio ◽  
...  
Keyword(s):  
Temporal Discrimination ◽  
Tactile Temporal Discrimination

Tactile temporal discrimination in patients with blepharospasm

2008 ◽  
Vol 79 (7) ◽  
pp. 796-798 ◽  
Author(s):  
M Fiorio ◽  
M Tinazzi ◽  
A Scontrini ◽  
C Stanzani ◽  
M Gambarin ◽  
...  
Keyword(s):  
Temporal Discrimination ◽  
Tactile Temporal Discrimination
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