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Titolo:
KINEMATIC ANALYSIS OF LOWER LIP MOVEMENTS IN ATAXIC DYSARTHRIA
Autore:
ACKERMANN H; HERTRICH I; SCHARF G;
Indirizzi:
UNIV TUBINGEN,DEPT NEUROL,HOPPE SEYLER STR 3 D-72076 TUBINGEN GERMANY
Titolo Testata:
Journal of speech and hearing research
fascicolo: 6, volume: 38, anno: 1995,
pagine: 1252 - 1259
SICI:
0022-4685(1995)38:6<1252:KAOLLM>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPEECH MOVEMENTS; VELOCITY PROFILES; CEREBELLAR; DEFICITS;
Keywords:
SPEECH MOTOR CONTROL; KINEMATIC ANALYSIS; ATAXIC DYSARTHRIA; CEREBELLUM;
Tipo documento:
Note
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
H. Ackermann et al., "KINEMATIC ANALYSIS OF LOWER LIP MOVEMENTS IN ATAXIC DYSARTHRIA", Journal of speech and hearing research, 38(6), 1995, pp. 1252-1259

Abstract

The present study investigates the influence of cerebellar:disorders on articulatory performance. A linear trend between peak velocity and movement amplitude seems to represent a basic organizational principleboth of upper limb and speech motor control. This relationship is preserved in arm movements of patients with cerebellar dysfunction. However, these subjects show a decreased slope of the respective regressionlines under the instruction to perform movements as fast as possible. In order to find out whether these findings also hold for speech motor control, peak velocity, range, and duration both of the opening and closing gestures during production of /pap/- as well as /pa:p/-sequences-embedded into a carrier phrase each-were measured using an optoelectric system. In addition, vowel length (/a/, /a:/) was determined at the acoustic speech signal: (a) The cerebellar patients showed a prolongation of both vowel targets. Most of them, nevertheless, presented with discernible durational contrasts; (b) The articulatory gestures were characterized by a highly linear relationship between peak velocity and movement range in the cerebellar as well as in the control group; (c) As a rule, the cerebellar subjects had decreased velocity-displacement ratios as compared to the normals; (d) The discrepancy in slope of the computed regression lines between the controls and the patients varied according to the type of movement (opening vs. closing gesture)and-to a lesser degree-linguistic demands (short vs, long vowel). These data indicate an impaired ability of cerebellar patients to increase muscular forces iri order to produce adequately scaled articulatory gestures of short duration.

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Documento generato il 14/08/20 alle ore 07:53:50