Greenberg's purely optical attention requires bracketing all semantic, historical, and contextual knowledge, a cognitive state neuroscience shows is architecturally impossible for human perceivers.
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bracketing(Used in the context of self-doubting higher-order evidence; distinct from simply discounting evidence in light of other evidence.)
The epistemic act of setting aside or ceasing to use first-order evidence when drawing conclusions, typically in response to higher-order defeating evidence.
contextual knowledge(as another type of knowledge that must be set aside)
Information about the background, circumstances, or situation surrounding something—like knowing when a painting was made or what was happening in the world at that time.
knowledge(Distinguished from mere true belief, which may be the product of indoctrination and need not exercise deliberative capacities.)
Justified true belief — true belief that has been arrived at through the exercise of deliberative capacities, including comparison of and deliberation among alternatives.
purely optical attention(Advocated by Greenberg (1960) and contested by embodied cognition theorists.)
A standard of aesthetic engagement with pictures that is confined to visual form alone, excluding bodily, motor, or empathetic responses.