Newborn infants detect cues of concurrent sound segregation

Alexandra Bendixen, Gábor P. Háden, Renáta Németh, Dávid Farkas, Miklós Török, István Winkler

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Separating concurrent sounds is fundamental for a veridical perception of one's auditory surroundings. Sound components that are harmonically related and start at the same time are usually grouped into a common perceptual object, whereas components that are not in harmonic relation or have different onset times are more likely to be perceived in terms of separate objects. Here we tested whether neonates are able to pick up the cues supporting this sound organization principle. We presented newborn infants with a series of complex tones with their harmonics in tune (creating the percept of a unitary sound object) and with manipulated variants, which gave the impression of two concurrently active sound sources. The manipulated variant had either one mistuned partial (single-cue condition) or the onset of this mistuned partial was also delayed (double-cue condition). Tuned and manipulated sounds were presented in random order with equal probabilities. Recording the neonates' electroencephalographic responses allowed us to evaluate their processing of the sounds. Results show that, in both conditions, mistuned sounds elicited a negative displacement of the event-related potential (ERP) relative to tuned sounds from 360 to 400 ms after sound onset. The mistuning-related ERP component resembles the object-related negativity (ORN) component in adults, which is associated with concurrent sound segregation. Delayed onset additionally led to a negative displacement from 160 to 200 ms, which was probably more related to the physical parameters of the sounds than to their perceptual segregation. The elicitation of an ORN-like response in newborn infants suggests that neonates possess the basic capabilities of segregating concurrent sounds by detecting inharmonic relations between the co-occurring sounds.

Original languageEnglish
Pages (from-to)172-181
Number of pages10
JournalDevelopmental Neuroscience
Volume37
Issue number2
DOIs
Publication statusPublished - Apr 24 2015

Keywords

  • Auditory scene analysis
  • Electroencephalogram
  • Instantaneous cues
  • Mistuning
  • Neonates
  • Object-related negativity
  • Onset asynchrony
  • Sound segregation
  • Vertical grouping

ASJC Scopus subject areas

  • Neurology
  • Developmental Neuroscience

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    Bendixen, A., Háden, G. P., Németh, R., Farkas, D., Török, M., & Winkler, I. (2015). Newborn infants detect cues of concurrent sound segregation. Developmental Neuroscience, 37(2), 172-181. https://doi.org/10.1159/000370237