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Titolo:
Effects of stimulus presentation rate on the activity of primary somatosensory cortex: A functional magnetic resonance imaging study in humans
Autore:
Takanashi, M; Abe, K; Yanagihara, T; Oshiro, Y; Watanabe, Y; Tanaka, H; Hirabuki, N; Nakamura, H; Fujita, N;
Indirizzi:
Osaka Univ, Grad Sch Med, Dept Neurol D4, Suita, Osaka 5650871, Japan Osaka Univ Suita Osaka Japan 5650871 urol D4, Suita, Osaka 5650871, Japan Osaka Univ, Grad Sch Med, Dept Anesthesiol, Suita, Osaka 5650871, Japan Osaka Univ Suita Osaka Japan 5650871 thesiol, Suita, Osaka 5650871, Japan Osaka Univ, Grad Sch Med, Dept Radiol, Suita, Osaka 5650871, Japan Osaka Univ Suita Osaka Japan 5650871 Radiol, Suita, Osaka 5650871, Japan
Titolo Testata:
BRAIN RESEARCH BULLETIN
fascicolo: 2, volume: 54, anno: 2001,
pagine: 125 - 129
SICI:
0361-9230(20010115)54:2<125:EOSPRO>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAN NERVE-STIMULATION; PRIMARY VISUAL-CORTEX; MOTOR CORTEX; MOVEMENT RATE; HUMAN BRAIN; LOCALIZATION; OXYGENATION; ACTIVATION; FREQUENCY; FMRI;
Keywords:
functional magnetic resonance imaging; echo planar imaging; BOLD; electrical somatosensory stimulation; stimulus presentation rate; primary somatosensory cortex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Abe, K Osaka Univ, Grad Sch Med, Dept Neurol D4, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan Osaka Univ 2-2 Yamadaoka Suita Osaka Japan 5650871 a 5650871, Japan
Citazione:
M. Takanashi et al., "Effects of stimulus presentation rate on the activity of primary somatosensory cortex: A functional magnetic resonance imaging study in humans", BRAIN RES B, 54(2), 2001, pp. 125-129

Abstract

To investigate the effect of stimulus presentation rate on the activity ofprimary somatosensory cortex, we performed echo-planar functional magneticresonance imaging using a 1.5-tesla magnetic resonance system. Eight right-handed normal volunteers underwent functional magnetic resonance imaging during somatosensory stimulation with a 0.2 ms electrical square wave to theleft index finger at 1, 4, 8, 16, and 32 Hz at constant intensity. Activated areas were located mainly around 'the hand area' of the right postcentral gyrus. Between 4 and 16 Hz, almost all subjects showed significant activation, but at 1 Hz and 32 Hz, five of eight subjects showed no activation. The average number of activated pixels in this area between 4 and 16 Hz weresignificantly greater than those at 1 Hz and 32 Hz, and the average percent signal increase had its activation peak at 8 Hz. Our results suggest thatthe existence of the optimal stimulation rate range may be a common phenomenon to a variety of sensory modalities. The electrical somatosensory stimulation rates from 4 Hr to 16 Hz are advisable to investigate the activationof the primary somatosensory cortex in human subjects, (C) 2001 Elsevier Science Inc.

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Documento generato il 06/04/20 alle ore 19:44:37