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May 9, 2026Developmental ScienceOpen Access

Hemodynamic Responses to Word Forms in Japanese Infant‐Directed Vocabulary in 5‐ and 9‐Month‐Old Infants: Early Sensitivity to Prosodic Structure and Emergence of Prosodic Representations

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Authors

YAYoritaka AkimotoMTMiki TakahasiNYNaoto Yamane

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Overview

Randomized trial examines hemodynamic responses to prosodic structure in infants, indicating early language sensitivity.

Key Points

  • To study hemodynamic responses to the prosodic structure of Japanese infant-directed vocabulary in 5- and 9-month-old infants.
  • Examined 5-month-old (n=31) and 9-month-old (n=34) Japanese infants using near-infrared spectroscopy;
  • Compared hemodynamic responses to infant-directed vocabulary forms vs. non-infant-directed forms;
  • Analyzed cortical responses focused on the left superior temporal gyrus.
  • Oxygenated hemoglobin levels were significantly greater for IDV compared to non-IDV in the left superior temporal gyrus (p<0.05);
  • 5-month-old infants exhibited sensitivity to prosodic structure, while 9-month-olds showed emerging phonological representation;
  • Observations suggest a transition from processing IDV structure to adult vocabulary patterns.

Cite This Study

Akimoto et al. (2026) studied this question.

synapsesocial.com/papers/69fed090b9154b0b82877950https://doi.org/10.1111/desc.70214
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