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Orientation-specific cortical responses develop in early infancy.

O J Braddick, J Wattam-Bell, J Atkinson

    Nature
    |April 17, 1986
    PubMed
    Summary
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    Newborns lack orientation-selective visual responses, but these measurable visual cortex functions emerge around six weeks of age. This indicates rapid development of infant visual processing shortly after birth.

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Visual System Research

    Background:

    • Neurones in the visual cortex of higher mammals exhibit selective responses to specific stimulus orientations.
    • Cortical and sub-cortical neurones in the visual pathway may lack orientation selectivity.

    Purpose of the Study:

    • To develop a visually evoked potential (VEP) technique to isolate orientation-selective neuronal responses.
    • To investigate the presence and emergence of orientation-selective visual responses in newborn infants.

    Main Methods:

    • Developed a novel VEP technique to differentiate orientation-selective from non-selective neuronal responses.
    • Conducted repeated longitudinal testing on individual newborn infants.

    Main Results:

    Related Experiment Videos

    • Orientation-selective visual responses were not detected in newborn infants using the developed VEP method.
    • Measurable orientation-selective responses began to emerge in infants around 6 weeks of age.

    Conclusions:

    • Human cortical visual function is immature at birth.
    • Rapid development of visual processing occurs within the first two postnatal months in infants.