Archives of Disease in Childhood - Fetal and Neonatal Edition 2007;92:F113-F116
ORIGINAL ARTICLE
Frontal cerebral blood flow change associated with infant-directed speech
1 Department of Psychology, Graduate School of Education, Hiroshima University, Hiroshima, Japan
2 Department of Pediatrics, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
3 Research Center for Advanced Science and Technology, Tokyo University, Tokyo, Japan
Correspondence to:
Y Saito
Department of Psychology, Hiroshima University, Kagamiyama 1-1-1, Higashi-Hiroshima, Hiroshima 739-8524, Japan; yuri{at}sep.email.ne.jp
Objective: To examine the auditory perception of maternal utterances by neonates using near-infrared spectroscopy (NIRS).
Methods: Twenty full-term, healthy neonates were included in this study. The neonates were tested in their cribs while they slept in a silent room. First, two probe holders were placed on the left and right sides of the forehead over the eyebrows using double-sided adhesive tape. The neonates were then exposed to auditory stimuli in the form of infant-directed speech (IDS) or adult-directed speech (ADS), sampled from each of the mothers, through an external auditory speaker.
Results: A 2 (stimulus: IDS and ADS) x 2 (recording site: channel 1 (right side) and channel 2 (left side)) analysis of variance for these relative oxygenated haemoglobin values showed that IDS (Mean = 0.25) increased brain function significantly (F = 3.51) more than ADS (Mean = –0.26).
Conclusions: IDS significantly increased brain function compared with ADS. These results suggest that the emotional tone of maternal utterances could have a role in activating the brains of neonates to attend to the utterances, even while sleeping.
Abbreviations: ADS, adult-directed speech; F0, fundamental frequency; IDS, infant-directed speech; NIRS, near-infrared spectroscopy; oxy-Hb, oxygenated haemoglobin; SPL, sound-pressure level
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Arch. Dis. Child. Fetal Neonatal Ed. 2007 92: F82.
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