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    Invest Ophthalmol Vis Sci. 1979 Apr;18(4):429-34.

    Spatial periodicities of periodic complex cells in the visual cortex cluster at one-half octave intervals.

    Abstract

    Within individual penetrations in the visual cortex, spatial periodicities of periodic complex cells differ by either one-half or one octave. When data are pooled from neurons subserving the central visual area in many cats, the results indicate that spatial periodicities cluster at one-half octave intervals over a 2 1/2-octave range (0.95 to 5.4 cyc/deg). Thus a relatively small number of such channels spaced at regular intervals along a logarithmic scale within each orientation column may suffice for this stage of spatial processing.

    PMID:
    429116
    [PubMed - indexed for MEDLINE]
    Free full text

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