The student will describe how the physical world is translated into a psychological experience. Describe the basic structures of the eye and ear, the associated neural pathways, and the process of sensory transduction. Recognize causes which can lead to hearing and vision deficits: include environmental causes, aging, genetics, diet, disease, and trauma. Describe the major theories associated with visual and auditory sensation and perception: include opponent process theory and trichromatic theory of vision, frequency theory, volley theory, and place theory of hearing. Analyze different perceptual illusions and describe why illusions are important for our understanding of perception. Compare top-down and bottom-up processing.