TT829 - Weekly Assignments with Professor Miller, Test and Teach PDF

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Weekly Assignments with Professor Miller, Test and Teach...

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My Question: #2 Talya Aasen How well can infants see detail? Changes occur in infant’s acuity overtime. The visual evoked potential indicates that visual acuity is poorly developed at birth. Then overtime, especially during 6 to 9 months, visual acuity gets better. Full adult acuity is finally reached by age 1. One method that has been used to measure infant visual acuity is the preferential looking technique. During this technique two stimuli are presented and the experimenter watches the infant’s eyes to determine where they are looking. To avoid bias, the experimenter does not know which stimuli is which. If the infant looks at a particular stimulus more than the other the experimenter concludes that the infant can tell the difference between them. Therefore, they conclude that the infant has the visual acuity to process patterned stimuli. Another method used is the visual evoked potential. In this technique disc electrodes are placed on the infant’s head, over the visual cortex. Researchers alternate a gray field with a checkerboard or striped pattern. If the checks or stripes are large enough to ‘alert’ the infant’s visual system an electrical response is generated. Again, the researchers can conclude the infant have developed visual acuity. The results compare because they both discover that the infant is able to see fine details. Either they stare at a particular stimulus or have brain activity that informs the experimenter that they do have visual acuity. Thus we can determine Changes occur overtime to better develop the infant’s visual acuity. Their cones and rods are spaced out at birth. With age, they become more tightly packed. Also, it helps with eye coordination. Question 1 Spectral sensitivity – eye sensitivity to light as a function of lights wavelength, measures by spectral sensitivity curve, relationship between wavelength and sensitivity Different curves Rods – 500 nanometers sensitive to light, help you see during the dark Cones – 560 nanometer sensitive to light, cones are more sensitive in the light Methods to measure Cone spectral sensitivity- look at test light, simulates only cones in fovea, Rods spectral sensitivity- dark adapted, test flashes in periphery, picking up with rods instead of cones, off fixation point Purkinjie shift- shift from cone to rod spectral sensitivity during dark adaptation, when its darker rods control vision, when its light the cone control vision....