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Titolo:
Differential fronto-parietal activation depending on force used in a precision grip task: An fMRI study
Autore:
Ehrsson, HK; Fagergren, A; Forssberg, H;
Indirizzi:
Karolinska Inst, Dept Neurosci, Div Human Brain Res, S-17177 Stockholm, Sweden Karolinska Inst Stockholm Sweden S-17177 Res, S-17177 Stockholm, Sweden Karolinska Inst, Dept Woman & Child Hlth, Motor Control Lab, S-17177 Stockholm, Sweden Karolinska Inst Stockholm Sweden S-17177 Lab, S-17177 Stockholm, Sweden
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 6, volume: 85, anno: 2001,
pagine: 2613 - 2623
SICI:
0022-3077(200106)85:6<2613:DFADOF>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
CEREBRAL BLOOD-FLOW; POSITRON EMISSION TOMOGRAPHY; PRIMARY MOTOR CORTEX; PRIMARY SOMATOSENSORY CORTEX; STANDARD ANATOMICAL SPACE; HUMAN-BRAIN; CORTICOSPINAL PROJECTIONS; FUNCTIONAL-ORGANIZATION; SENSORY STIMULATION; SENSORIMOTOR CORTEX;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
78
Recensione:
Indirizzi per estratti:
Indirizzo: Ehrsson, HK Astrid Lindgren Hosp, Dept Women & Child Hlth, Neuropediat Unit, S-17176 Stockholm, Sweden Astrid Lindgren Hosp Stockholm Sweden S-17176 ckholm, Sweden
Citazione:
H.K. Ehrsson et al., "Differential fronto-parietal activation depending on force used in a precision grip task: An fMRI study", J NEUROPHYS, 85(6), 2001, pp. 2613-2623

Abstract

Recent functional magnetic resonance imaging (fMRI) studies suggest that the control of fingertip forces between the index finger and the thumb (precision grips) is dependent on bilateral frontal and parietal regions in addition to the primary motor cortex contralateral to the grasping hand. Here we use fMRI to examine the hypothesis that some of the areas of the brain associated with precision grips are more strongly engaged when subjects generate small grip forces than when they employ large grip forces. Subjects grasped a stationary object using a precision grip and employed a small force (3.8 N) that was representative of the forces that are typically used when manipulating small objects with precision grips in everyday situations or alarge force (16.6 N) that represents a somewhat excessive force compared with normal everyday usage. Both force conditions involved the generation oftime-variant static and dynamic grip forces under isometric conditions guided by auditory and tactile cues. The main finding was that we observed stronger activity in the bilateral cortex lining the inferior part of the precentral sulcus (area 44/ventral premotor cortex), the rostral cingulate motor area, and the right intraparietal cortex when subjects applied a small force in comparison to when they generated a larger force. This observation suggests that secondary sensorimotor related areas in the frontal and parietal lobes play an important role in the control of fine precision grip forces in the range typically used for the manipulation of small objects.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 12:44:56