Ch 5 Perception - Ch 5 Perception concept: bundle of info...

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Ch 5 Perception concept: bundle of info of various generalizations about the category to which observed object is readily attributed Either concrete (cat) or abstract (danger) more computational terms in the mind BUT perception ≠ conception Sensory stimulation gets computed into raw, phenomenal, pre-conceptual feel of sensing the world Perception feasible because sensory envir. is computationally tractable and brain is well attuned to it 1. Perceptual Measurement a. Retinal mosaic: closely packed photoreceptors b. Hyperacuity: much higher resolution than what seems possible; depends on i. Channel coding by graded, overlapping receptive fields ii. Imaging subsystem of the eye iii. Geometry of retina iv. Functional profiles of the receptive fields of its cells c. Visual acuity affected by optics (cornea, lens, etc) and sampling (how packed photoreceptors are), both of which need to be improved together to enhance resolution d. Two dots vs. vernier i. Two dots info concentrated on the dots; if fall on same photoreceptor, cannot be distinguished ii. Vernier info distributed along two lines which can be integrated 2. Representation spaces a. Several inputs cloud of points / representation face space in the example of seeing faces i. Unavoidable, Real b. Discrimination; Distinct if point far removed from a cloud (outlier) c. Conflation: average if falls in cloud d. Can be warped by selective attention i. Squash intra-category differences ii. Expand inter-category differences 3. Perceptual constancies: squashing the view space/treating points as equivalent; distill out the few intrinsic variables of interest a. All perceptual problems share the same computational structure b. Problems: i. lightness underdetermined ii. intrinsic cannot be separated from extrinsic iii. system of equations that have infinitely valid solutions 1. some variables not just multi-dimensional – infinite-dimensional a. ex. wavelength is a continuous quantity that needs infinitely precise meas.
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Ch 5 Perception - Ch 5 Perception concept: bundle of info...

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