Development of ultrasonic vocalizations in ICR mice : acoustic features and syllable patterns

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  • ICRマウスにおける超音波発声の発達 : 音響的特徴と発声パターン
  • ICR マウス ニオケル チョウオンパ ハッセイ ノ ハッタツ : オンキョウテキ トクチョウ ト ハッセイ パターン

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Ultrasonic vocalizations (USV) of mouse pup trigger nurturing behavior of parents and are quantifiable indicator of urge for maternal care. In this study, we analyzed development of acoustic characteristics of USV in ICR mouse pups and compared them to those in other strains. Their USVs were able to classified into 12 patterns based on their acoustic characteristics such as presence of frequency modulation (FM). Pups of ICR mouse produced calls with similar acoustic characteristics compareble to those in other strains. Furthermore, syllable repertoire composition was similar to other strain; syllables with distinct FM accounted for more than half of vocalizations. Our results show that ICR strain share the similar USV developmental patterns with other strina, and that USV with multiple FMs may be an important call for maternal care, regardless of mouse strain.

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