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Titolo:
A PARAMETRIC ANALYSIS OF THE RATE EFFECT IN THE SENSORIMOTOR CORTEX -A FUNCTIONAL MAGNETIC-RESONANCE-IMAGING ANALYSIS IN HUMAN-SUBJECTS
Autore:
JANCKE L; SPECHT K; MIRZAZADE S; LOOSE R; HIMMELBACH M; LUTZ K; SHAH NJ;
Indirizzi:
OTTO VON GUERICKE UNIV,INST GEN PSYCHOL,LENNESTR 6 D-39112 MAGDEBURG GERMANY RES CTR,INST MED JULICH GERMANY
Titolo Testata:
Neuroscience letters
fascicolo: 1, volume: 252, anno: 1998,
pagine: 37 - 40
SICI:
0304-3940(1998)252:1<37:APAOTR>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN MOTOR CORTEX; CEREBRAL ACTIVATION; TASK;
Keywords:
FUNCTIONAL MAGNETIC RESONANCE TOMOGRAPHY; HAND MOVEMENT; RATE EFFECT; MOTOR CONTROL; CORTEX;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
L. Jancke et al., "A PARAMETRIC ANALYSIS OF THE RATE EFFECT IN THE SENSORIMOTOR CORTEX -A FUNCTIONAL MAGNETIC-RESONANCE-IMAGING ANALYSIS IN HUMAN-SUBJECTS", Neuroscience letters, 252(1), 1998, pp. 37-40

Abstract

We studied the effects of different movement speeds of unimanual right hand movements on functional magnetic resonance signal changes in the sensorimotor cortex using echo planar imaging (EPI). Six healthy right-handed subjects were scanned at rest and while executing a finger tapping task with their right index finger. Movement frequency was visually paced at rates ranging from 0.5 to 5 Hz, separated by 0.5 Hz steps. The blood oxygen level dependent (BOLD) response within the left sensorimotor cortex was linearly and positively related to movement frequency. However, this relation holds (r(2) = 0.91) only for movement frequencies faster than 1 Hz (1.5-5 Hz). For the slower frequencies there was an initial sharp increase of the BOLD response from 0.5 to 1 Hz followed by an activity drop for 1.5 Hz. These results are compatible with the idea that two different motor control modes are operative during slow or fast movements. During slow movements a computational demanding on-line feedback control mode is operative resulting in strong BOLD signals indicating extensive neural activity. During faster movements on the other hand a program-like motor control mode is operative resulting in less demanding neural computations. The amount of neural computation for the latter control mode increases with increasing movement speed. (C) 1998 Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 22:30:29