title: Effects of stimulus rate on the auditory cortex using fMRI with 'sparse' temporal sampling.
abstract: The purpose of this study was to evaluate the effects of the auditory stimulus presentation rate on signal response during fMRI with a minimal effect of scanner acoustic noise. Six subjects received auditory stimulus with a pure tone (1000 Hz, 30 ms duration) at presentation rates of 0.5, 2, 5, 10 and 20 Hz. Echo planar images were obtained with a long TR of 12 s and clustered multi-slice acquisition. The number of activated pixels and percentage signal change were measured in the transverse temporal gyri, which revealed that these values at 5 Hz were significantly greater than those at 0.5 Hz and at 20 Hz.
authors.affiliation: Department of Radiology, Osaka University Medical School, Suita, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tanaka
authors.forename: N
authors.initials: N
authors.lastname: Fujita
authors.forename: Y
authors.initials: Y
authors.lastname: Watanabe
authors.forename: N
authors.initials: N
authors.lastname: Hirabuki
authors.forename: M
authors.initials: M
authors.lastname: Takanashi
authors.forename: Y
authors.initials: Y
authors.lastname: Oshiro
authors.forename: H
authors.initials: H
authors.lastname: Nakamura
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001303:Auditory Cortex / Q000502:physiology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D013702:Temporal Lobe / Q000502:physiology