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Experience is Instrumental in Tuning a Link Between Language and Cognition: Evidence from 6- to 7- Month-Old Infants' Object Categorization
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Voice categorization in the four-month-old human brain.

Roberta P Calce1, Diane Rekow2, Francesca M Barbero1

  • 1Crossmodal Perception and Plasticity Laboratory, Institute of Research in Psychology (IPSY) and Institute of Neuroscience (IoNS), Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium.

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|December 14, 2023
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Summary

The infant brain shows a preferential response to voices by 4 months of age. This early voice selectivity suggests an innate ability to process socially relevant auditory information.

Keywords:
developmentdevelopmental cognitive neuroscienceelectroencephalographyfrequency-tagginginfancyvoice

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Auditory Processing

Background:

  • Voices are crucial social sounds for human development.
  • Adult studies show voice-selective regions in the brain.
  • Infant voice selectivity remains largely unknown.

Purpose of the Study:

  • To investigate if the infant brain exhibits voice selectivity.
  • To determine the age at which voice selectivity emerges.
  • To understand the neural basis of early auditory processing.

Main Methods:

  • Utilized fast periodic auditory stimulation (FPAS) with scalp electroencephalography (EEG).
  • Tested 23 four-month-old infants with vocal and non-vocal sounds.
  • Analyzed brain responses to identify voice-selective neural activity.

Main Results:

  • Identified a reliable voice-selective response in the temporal regions of infant brains.
  • Found individual voice selectivity in most infants within minutes.
  • Demonstrated that selectivity is not solely based on sound envelope or spectral content.

Conclusions:

  • The 4-month-old infant brain demonstrates functional selectivity for voices.
  • This suggests an early-emerging, specialized neural system for processing socially relevant sounds.
  • Infants possess a remarkable capacity for rapid auditory category development.