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D A Pollen, S E Feldon; Spatial periodicities of periodic complex cells in the visual cortex cluster at one-half octave intervals.. Invest. Ophthalmol. Vis. Sci. 1979;18(4):429-434.
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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.
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