Developmental changes in the categorization of speech and song

Area of Science:

• Cognitive Science
• Developmental Psychology
• Auditory Perception

Background:

• Music and language are fundamental human communication forms.
• Distinguishing between speech and song is not fully understood, especially in developing listeners.
• Previous research has focused on domain-specific knowledge rather than categorization abilities.

Purpose of the Study:

• To investigate how children and adults categorize speech and song.
• To identify developmental changes in speech and song perception and conceptualization.
• To determine the acoustic features listeners use to differentiate speech from song.

Main Methods:

• Study 1: Online survey data from 4- to 17-year-olds and adults on speech and song distinctions.
• Study 2: Perceptual categorization task with ambiguous speech-song stimuli for 4- to 8-year-olds and adults.
• Acoustic feature analysis of vocal stimuli.

Main Results:

• Listeners of all ages use acoustic features to differentiate speech and song, with younger children (4-7) relying more on volume.
• Categorization ability improves with age, particularly for identifying song.
• Younger children (4-6) rated ambiguous stimuli as more song-like than older children and adults.
• Acoustic features like F0 instability, utterance duration, harmonicity, and spectral flux predict song ratings, with cue weighting changing developmentally.

Conclusions:

• Children develop conceptual and perceptual abilities to categorize speech and song from age 4.
• Children under 8 are still refining their understanding of crucial acoustic cues for categorization.
• Developmental changes in acoustic cue weighting suggest that music and language skills may not be entirely domain-specific.