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- W2012102349 abstract "Functional magnetic resonance imaging (fMRI) is one of the principal neuroimaging techniques for studying human audition, but it generates an intense background sound which hinders listening performance and confounds measures of the auditory response. This paper reports the perceptual effects of an active noise control (ANC) system that operates in the electromagnetically hostile and physically compact neuroimaging environment to provide significant noise reduction, without interfering with image quality. Cancellation was first evaluated at 600Hz, corresponding to the dominant peak in the power spectrum of the background sound and at which cancellation is maximally effective. Microphone measurements at the ear demonstrated 35dB of acoustic attenuation [from 93to58dB sound pressure level (SPL)], while masked detection thresholds improved by 20dB (from 74to54dB SPL). Considerable perceptual benefits were also obtained across other frequencies, including those corresponding to dips in the spectrum of the background sound. Cancellation also improved the statistical detection of sound-related cortical activation, especially for sounds presented at low intensities. These results confirm that ANC offers substantial benefits for fMRI research." @default.
- W2012102349 created "2016-06-24" @default.
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- W2012102349 date "2009-01-01" @default.
- W2012102349 modified "2023-10-06" @default.
- W2012102349 title "Acoustic, psychophysical, and neuroimaging measurements of the effectiveness of active cancellation during auditory functional magnetic resonance imaging" @default.
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- W2012102349 doi "https://doi.org/10.1121/1.3021437" @default.
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