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Transcript
Psychology 304: Brain and Behaviour Lecture 26 1 From last class …. 2 Touch Receptors 3 Dorsal-Column Medial-Lemniscus Pathway 4 The Somatosensory System and the Auditory System 1. What are the major areas of the brain that are associated with the perception of touch? 2. What are the physical and perceptual dimensions of sound? 5 By the end of today’s class, you should be able to: 1. identify the locations and functions of the primary cortex, secondary cortex, and association areas for touch. 2. describe the condition “asomatognosia.” 3. describe the three physical and three perceptual dimensions associated with sound. 6 What are the major areas of the brain that are associated with the perception of touch? (continued) • The majority of thalamic neurons that receive touch information subsequently project the information to the primary somatosensory cortex (SI). Thereafter, information is projected to the secondary somatosensory cortex (SII) and the posterior parietal cortex. 7 Primary Somatosensory Cortex (SI) Somatosensory Association Cortex Secondary Somatosensory Cortex (SII) Somatosensory Areas of the Brain 8 • The major brain areas associated with the perception of touch are somatotropically organized—that is, organized according to a map of the body. • The somatotropic map found in SI is referred to as the somatosenosry homunculus. The representation of the body in the somatosensory homunculus is distorted. 9 The Primary Somatosensory Cortex 10 The Nerve-Weighted Man 11 What are the physical and perceptual dimensions of sound? • Sounds are produced by objects that cause air molecules to vibrate. • As they vibrate, the air molecules alternately condense and expand, producing sound waves. • Sound waves vary on three physical dimensions. Each physical dimension uniquely influences our perception of sound. 12 Physical and Perceptual Dimensions of Sound Waves 13 The Somatosensory System and the Auditory System 1. What are the major areas of the brain that are associated with the perception of touch? 2. What are the physical and perceptual dimensions of sound? 14
