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Neural interactions and subjective contours.

S Coren
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Abstract

Increment thresholds were measured on either side of the locus of subjective contours and inequivalent loci for control figures. The data indicate a small change in increment threshold value in the direction predicted by theories postulating neural interactive components in the formation of subjective contours.

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Differential ThresholdForm PerceptionHumansLightModels, NeurologicalNeural InhibitionOptical IllusionsRetinaVisual CortexVisual FieldsVisual PathwaysVisual PerceptionJournal Article

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S Coren. 1977. Neural interactions and subjective contours.. https://doi.org/10.1068/p060107

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Direct evidence for the existence of energy-based texture mechanisms.

Two classes of models have been proposed to explain how the visual system processes texture modulations. In 'feature models', abstract representations of the featural properties of local texture regions (eg orientation, spatial frequency, contrast) are first generated, after which differences in individual feature properties across space are detected. In 'energy models', on the other hand, differences across space in the response energies of linear simple-cell-like filters are detected. This model thus processes the existing differences between texture regions directly without generating a full representation of the individual texture regions. We provide here direct evidence for the existence of the second, energy model, using an adaptation paradigm in conjunction with textures simultaneously modulated in two dimensions--orientation and spatial frequency. We found that the mechanism that processed the conjoint modulation was tuned to orientations and spatial frequencies that could not be predicted by any feature model, but which were precisely predicted by the energy model.

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