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Journal of Biomedical Optics • Open Access

Active versus passive listening to auditory streaming stimuli: a near-infrared spectroscopy study
Author(s): Gerard B. Remijn; Haruyuki Kojima

Paper Abstract

We use near-infrared spectroscopy (NIRS) to assess listeners' cortical responses to a 10-s series of pure tones separated in frequency. Listeners are instructed to either judge the rhythm of these "streaming" stimuli (active-response listening) or to listen to the stimuli passively. Experiment 1 shows that active-response listening causes increases in oxygenated hemoglobin (oxy-Hb) in response to all stimuli, generally over the (pre)motor cortices. The oxy-Hb increases are significantly larger over the right hemisphere than over the left for the final 5 s of the stimulus. Hemodynamic levels do not vary with changes in the frequency separation between the tones and corresponding changes in perceived rhythm ("gallop," "streaming," or "ambiguous"). Experiment 2 shows that hemodynamic levels are strongly influenced by listening mode. For the majority of time windows, active-response listening causes significantly larger oxy-Hb increases than passive listening, significantly over the left hemisphere during the stimulus and over both hemispheres after the stimulus. This difference cannot be attributed to physical motor activity and preparation related to button pressing after stimulus end, because this is required in both listening modes.

Paper Details

Date Published: 1 May 2010
PDF: 9 pages
J. Biomed. Opt. 15(3) 037006 doi: 10.1117/1.3431104
Published in: Journal of Biomedical Optics Volume 15, Issue 3
Show Author Affiliations
Gerard B. Remijn, Kyushu Univ. (Japan)
Haruyuki Kojima, Kanazawa Univ. (Japan)

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