PSYC 215 Chapter Notes -Vestibular Duct, Cochlear Duct, Joseph Fourier
12 Mar 2014
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Introduction: vision is restricted to the immediate field of vision (approximately 200 ) and relies on the presence of an adequate light source. Sound can be sensed in all directions, and through opaque occluding bodies. Sound as a physical stimulus: sound consists of pressure waves carried by vibrating air molecules, produced by a vibrating surface. Areas where air pressure is increased are compressions, and areas where pressure is decreased are rarefactions: distal stimulus: sounds from the outside world, e. g. car, music, speech. This is because water is more elastic than air. Simple sounds: longitudinal waves: displacement of air particles is parallel to propagation movement, like sound. There is no net motion of any individual particle, they simply oscillate: transverse waves: displacement of air molecules is perpendicular to propagation movement, like light. Page 2 of 12 sensitivity: waves can have both transverse and longitudinal components: surface of water, for an object to create sound, it must vibrate.
