PSYC 372 Lecture Notes - Lecture 3: Prosopagnosia, Leotard, Akinetopsia
20 Aug 2016
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Document Summary
Saturation: relative purity of light being perceived. Radiation of one wavelength is fully saturated (pure) Visual receptors are sensitive to particles of energy (electromagnetic radiation) called photons. Receptors then transduce (convert) energy into neural signals. Visual system receptors: rods and cones coding of visual info. Light is focused by lens and cornea onto retina. Light from left side strikes right side of the retina and vice versa retina. Nearly free of ganglion axons and blood vessels. Ganglion cells: axons form optic nerve vertebrate retina consist of 2 kinds of receptors. Rods: most abundant in the periphery of the eye (120 mil per retina) A greater number of receptors converge into ganglion and bipolar cells. Larger visual field; less detailed vision in peripheral. Cones: most abundant in/around fovea (6 mil per retina) Essential for color vision; more useful in bright light. Perception of color depends on wavelength of light. Shortest perceived by humans: 400 nm violet.
