PSYC 395 Lecture Notes - Lecture 6: Optic Chiasm, Visual Cortex, Visual Perception
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Skip: thresholds (p. 231-233) and esp (p. 272-273) Energy: comes in various forms from the outside world (sound, light, heat, etc. ) Accessory structures: gather and modify the energy. Transduction: the process of converting the energy to neural impulse. (important) Occurs in the retina and is performed by photoreceptors. The two basic types of photoreceptors are rods and cones. (important) Transduction also involves bipolar cells, interneurons, and ganglion cells. (figure 6. 15,p. 241) (table 6. 1,p. 242) The neural impulses travel from the ganglion cells along the following path: optic nerve to optic chiasm to thalamus to primary visual cortex. Each half of the brain views the opposite side of the real world. (figure 2. 33,p. 83) One is most sensitive to short wavelengths (blue) One is most sensitive to medium wavelengths (green) One is most sensitive to long wavelengths (red) Visual elements sensitive to color are grouped into three pairs, and members of each pair oppose or inhibit each other.
