PSY 3061 1st Edition Lecture 13Outline of Last Lecture I. VisionII. Rods and conesIII. High and low acuity visionIV. From retina to brainOutline of Current Lecture I. Answers from last quizII. Lateral inhibitionIII. ColorsCurrent LectureI. Answers from last quiza. Apexb. Smallerc. Peripheryd. Loudness and timing differencesII. Lateral inhibitiona. Lateral inhibition in the human eye takes place because of horizontal cellsb. These cells work to inhibit a given photoreceptor’s neighbors if the photoreceptor receives stimulationc. Periodic inhibition of this ganglion cell when its “surround” photoreceptoris illuminatedd. Applies to cones and rodse. Excitation of an on center ganglion cell with different area of illuminationIII. Colorsa. Light of three different wavelengths can be added to each other to produce what we perceive as different colorsb. Perception of color depends on an object’s reflectance proportion of light from separate wavelengths that a surface reflectsc. Three different pigments are found in three different types of cones cones sensitive to different wavelengths of lightd. Color constancy: perception than an object is the same color under changing types of illuminatione. Retinex theory: our visual system perceives color based on the relative amount of long, medium, and short wavelength light transduced by the retinaf. Dual-opponent color cells: cells in primary visual cortex compute the ratioof long, medium, and short wave stimulation and perceive colors based on the
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