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Related Experiment Videos

Early post-natal development of neuronal function in the kitten's visual cortex: a laminar analysis.

K Albus, W Wolf

    The Journal of Physiology
    |March 1, 1984
    PubMed
    Summary

    Visual cortex development in kittens shows significant changes in neuronal function and organization during the first post-natal month. Neuronal receptive field properties and spatial arrangements mature rapidly, reaching adult levels by the fourth week.

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    Area of Science:

    • Neuroscience
    • Developmental Neuroscience
    • Visual System Development

    Background:

    • Post-natal development of the visual cortex is crucial for establishing normal visual perception.
    • Understanding the maturation of neuronal properties, such as receptive fields and orientation specificity, is key to comprehending visual system development.

    Purpose of the Study:

    • To investigate the normal post-natal development of visual cortical functions in kittens.
    • To analyze laminar differences in the developmental trends of receptive field properties and neuronal organization.

    Main Methods:

    • Extracellular recordings from 612 single neurons in the striate and parastriate cortex of kittens aged 6 to 24 days.
    • Analysis of receptive field properties including orientation specificity and spatial organization of 'on' and 'off' zones.

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  • Examination of neuronal distribution across cortical layers and development of spatial order in neuronal arrangement.

    • Main Results:

    • Neuronal receptive field types (unimodal 'off', unimodal 'on', multimodal) show changing frequencies during the first month, with multimodal neurons increasing.
    • The proportion of 'on-off' neurons remains consistently low throughout the early post-natal period.
    • Neuronal occurrence in layers 2/3 and 5 is low in young kittens but improves, while layers 4 and 6 show normal frequencies.
    • Spatial order of orientation-specific neurons and ocular dominance distribution rapidly improves, reaching adult levels by the fourth week.
    • Orientation selectivity increases significantly after lid opening, with adult-like proportions by the end of the fourth week.
    • Orientation-selective neurons initially appear in deeper layers (4, 6, lower 3) and later in more superficial layers (2/3, 5).

    Conclusions:

    • The functional development of visual cortical neurons in kittens is dependent on receptive field type and intracortical location during the first post-natal month.
    • Maturation of visual cortical functions involves distinct developmental timelines for different neuronal properties and laminar populations.
    • The study highlights the critical period of visual cortex development and the factors influencing neuronal maturation.