Near-infrared spectroscopic imaging of stimulus-related hemodynamic responses on the neonatal auditory cortices

Kalle Kotilahti; Ilkka Nissila; Riikka Makela; Tommi Noponen; Lauri Lipiainen; Nasia Gavrielides; Timo Kajava; Minna Huotilainen; Vineta Fellman; Pekka Merilainen; Toivo Katila

doi:10.1117/12.590180

28 April 2005 Near-infrared spectroscopic imaging of stimulus-related hemodynamic responses on the neonatal auditory cortices

Kalle Kotilahti, Ilkka Nissila, Riikka Makela, Tommi Noponen, Lauri Lipiainen, Nasia Gavrielides, Timo Kajava, Minna Huotilainen, Vineta Fellman, Pekka Merilainen, Toivo Katila

Author Affiliations +

Proceedings Volume 5693, Optical Tomography and Spectroscopy of Tissue VI; (2005) https://doi.org/10.1117/12.590180
Event: SPIE BiOS, 2005, San Jose, CA, United States

Abstract

We have used near-infrared spectroscopy (NIRS) to study hemodynamic auditory evoked responses on 7 full-term neonates. Measurements were done simultaneously above both auditory cortices to study the distribution of speech and music processing between hemispheres using a 16-channel frequency-domain instrument. The stimulation consisted of 5-second samples of music and speech with a 25-second silent interval. In response to stimulation, a significant increase in the concentration of oxygenated hemoglobin ([HbO₂]) was detected in 6 out of 7 subjects. The strongest responses in [HbO₂] were seen near the measurement location above the ear on both hemispheres. The mean latency of the maximum responses was 9.42±1.51 s. On the left hemisphere (LH), the maximum amplitude of the average [HbO₂] response to the music stimuli was 0.76± 0.38 μ M (mean±std.) and to the speech stimuli 1.00± 0.45 μ± μM. On the right hemisphere (RH), the maximum amplitude of the average [HbO₂] response was 1.29± 0.85 μM to the music stimuli and 1.23± 0.93 μM to the speech stimuli. The results indicate that auditory information is processed on both auditory cortices, but LH is more concentrated to process speech than music information. No significant differences in the locations and the latencies of the maximum responses relative to the stimulus type were found.

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Kalle Kotilahti, Ilkka Nissila, Riikka Makela, Tommi Noponen, Lauri Lipiainen, Nasia Gavrielides, Timo Kajava, Minna Huotilainen, Vineta Fellman, Pekka Merilainen, and Toivo Katila "Near-infrared spectroscopic imaging of stimulus-related hemodynamic responses on the neonatal auditory cortices", Proc. SPIE 5693, Optical Tomography and Spectroscopy of Tissue VI, (28 April 2005); https://doi.org/10.1117/12.590180

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