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Related Experiment Videos

Functional changes across the 17-18 border in the cat

G A Orban, H Kennedy, H Maes

    Experimental Brain Research
    |January 1, 1980
    PubMed
    Summary

    Velocity sensitivity changes effectively identify the 17-18 border in visual cortex, correlating with histological findings. Receptive field changes were less useful for this identification in central and paracentral vision areas.

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    Area of Science:

    • Neuroscience
    • Visual Cortex Research
    • Cortical Mapping

    Background:

    • The boundary between visual areas 17 and 18 is crucial for understanding visual processing.
    • Accurate identification of this border is essential for correlating physiological and anatomical data.
    • Previous methods for border identification may lack precision in certain cortical regions.

    Purpose of the Study:

    • To investigate the utility of physiological measures, specifically changes in velocity sensitivity, receptive field (RF) position, and RF size, for identifying the 17-18 border.
    • To compare the effectiveness of these physiological measures with histological reconstruction for border determination.
    • To examine these changes in both central/paracentral and peripheral visual cortex.

    Main Methods:

    • Long oblique penetrations were made across the 17-18 border in the visual cortex.
    • Histological reconstruction was used to precisely determine the cortical border.
    • Physiological recordings measured changes in velocity sensitivity, receptive field position, and receptive field size.
    • Data were analyzed for central, paracentral, and peripheral visual field representations.

    Main Results:

    • Changes in velocity sensitivity provided a reliable physiological marker for identifying the 17-18 border, particularly correlating well with the histological border zone.
    • Receptive field position and size changes were found to be of limited use for physiological border identification in this region.
    • In the representation of the vertical meridian (VM) in area 18, a high magnification factor was observed.
    • In peripheral vision, velocity sensitivity changes were subtle, and receptive field position changes aligned with cytoarchitectonics.

    Conclusions:

    • Velocity sensitivity is a key physiological indicator for mapping the 17-18 border in the visual cortex.
    • Histological correlation confirms the validity of velocity sensitivity changes for border identification.
    • Receptive field properties offer less reliable markers for this specific border region compared to velocity sensitivity.

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