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my notes Chapter 16

my notes Chapter 16 - Chapter 16 VISUAL Visual acuity...

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Chapter 16 VISUAL Visual acuity : Preferential looking technique depends on spontaneous looking preferences measuring acuity by the smallest thickness of bars that would lead to preferential looking Note that the gray stimuli and the contrast bars reflect the same amount of light. i.e. they both have the same AVERAGE INTENSITY. Visual evoked potential here only one stimuli is portrayed and altered slowly the VEP results in a higher response because its more accurate the fines of the gating is measured in SPATIAL FREQUENCY Cycles/degree visual angle Reasons: retina VIMP: the rod dominated peripheral area is fully developed Cone- Widely spaced FAT inner segments – leads to a coarse lattice with a lot of spaces SMALL outer segments- means has less visual pigments to process light Note in adults the inner=outer segments Adults outer segments cover 68% of the fovea Infants outer segments cover 2% of the fovea Cortex Visual acuity= see fine details → here we measure the narrowest bar that can be identified visual sensitivity= sees objects in the environment→ here we measure the contrast!
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