By Stephen Grossberg (Eds.)
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Extra resources for The Adaptive Brain IIVision, Speech, Language, and Motor Control
A purely feedforward interaction from monocular toward binocular rells cannot generate the main properties of rivalry, namely a sustained monocular percept followed by rapid and complete suppression of this percept when it is supplanted by the other monocular percept. This is because the very activity of the perceived representation must be the cause of its habituation and loss of competitive advantage relative to the suppressed representation. Consequently. the habituating signals from the perceived representation that inhibit the suppressed representation reach the latter at a stage at, or prior to, that representation’s locus for generating signals to the perceived representation that are capable of habituating.
A model in which the different sinusoidal spatial frequencies are independently filtered by separate spatial channels or scales fits the data much better. Recall from Section 6 some of the other data that also suggest the existence of multiple scales. A related advantage of the multiple channel idea is that one can filter a complex pattern into its component spatial frequencies, weight each component with a factor that mirrors the sensitivity of the human observer to that channel, and then resynthesize the weighted pattern and compare it with an observer’s perceptions.
The use of a stereogram composed of two separate pictures does not always approximate well the way two eyes view a single picture. When both eyes focus on a single point within a patterned planar surface viewed in depth, the fixation point is a point of minimal binocular disparity. Points increasingly far from the fixation point have increasingly large binocular disparities. Why does such a plane not recede toward optical infinity at the fixation point and curve toward the observer at the periphery of the visual field?