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Infants as young as 9 months can distinguish between autonomy-supportive and controlling tones in directive speech. This early discrimination highlights the importance of vocal tone in infant development and learning.

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Area of Science:

  • Developmental Psychology
  • Infant Communication
  • Early Childhood Education

Background:

  • Directive communication is crucial for guiding children's actions and development.
  • Autonomy support and control are two key motivational qualities in directive speech.
  • Vocal tone is a primary communication channel for preverbal infants.

Purpose of the Study:

  • To investigate infants' ability to discriminate motivational qualities in directive speech based on vocal tone.
  • To explore the role of tone of voice in conveying autonomy-supportive versus controlling messages to infants.
  • To understand the early development of sensitivity to social-communicative cues.

Main Methods:

  • An experiment was conducted with 39 infants aged 9–12 months.
  • Infants were exposed to directive phrases spoken in either autonomy-supportive or controlling tones.
  • Stimuli were validated phrases recorded by day-care staff.

Main Results:

  • Infants showed differential attention to vocal tones.
  • A longer attention duration was observed for controlling tones compared to autonomy-supportive tones.
  • This indicates infants' capacity to discriminate between these motivational qualities at an early age.

Conclusions:

  • Infants can discriminate between autonomy-supportive and controlling vocal tones in directive speech.
  • This early discrimination has implications for infant social-emotional development and learning.
  • Understanding vocal tone's role is vital for effective early childhood communication strategies.