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Related Experiment Videos

[Development of auditory-visual spatial integration using saccadic response time as the index].

Masaharu Kato1, Kaoru Konishi, Makiko Kurosawa

  • 1Department of Infant Brain and Cognitive Development, Tokyo Women's Medical University, Tokyo.

No to Hattatsu = Brain and Development
|May 24, 2006
PubMed
Summary
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Infants develop auditory-visual spatial integration between 5 and 11 months, as shown by shorter saccadic response times (SRTs) to multisensory stimuli. This developmental change impacts eye movement control and superior colliculus function.

Area of Science:

  • Developmental neuroscience
  • Sensory processing
  • Ophthalmology

Context:

  • Infants' ability to integrate auditory and visual information is crucial for development.
  • Understanding the timeline of auditory-visual integration is key to identifying developmental milestones.
  • Saccadic eye movements provide a measurable indicator of sensory processing and integration.

Purpose:

  • To investigate the developmental trajectory of auditory-visual spatial integration in infants.
  • To determine the age at which infants can effectively integrate spatially aligned and misaligned auditory and visual stimuli.
  • To explore the neural mechanisms, including cortical control of the superior colliculus, underlying this integration process.

Summary:

  • Saccadic response times (SRTs) were measured in 4-, 5-, and 11-month-old infants using electro-oculography (EOG) while they were exposed to ipsilateral or contralateral auditory-visual stimuli.

Related Experiment Videos

  • SRTs decreased with age, indicating developmental improvements in processing speed.
  • While SRTs were similar for visual-only and ipsilateral auditory-visual stimuli across all ages, significantly longer SRTs for contralateral stimuli in 11-month-olds, compared to younger infants, suggest the emergence of auditory-visual spatial integration.

    • Impact:

    • Findings indicate that infants develop the capacity for auditory-visual spatial integration between 5 and 11 months of age.
    • The results suggest that the superior colliculus's cortical control, influenced by stimulus spatial configuration, matures during this period.
    • The study highlights potentially distinct developmental timelines for multiple pathways involved in superior colliculus control.