C_S_D 2120 Lecture Notes - Lecture 19: Audiometry, Bone Conduction, Audiometer
Document Summary
What is hearing: simple definition: the sense of perceiving sound, much more complicated than that (of course) Sound fundamentals: physical bases of sound measurements: Getting sound started: mass amount of material in a given object. Hearing science: elasticity an object"s ability to return to it"s original shape after being deformed (compressed or stretched) Key aspect here: up and down motion or back and forth motion . Examining what is measurable: frequency in hertz (hz) pitch. Number of cycles of vibration that occur in 1 second: amplitude in decibels (db) volume. Hearing tests: informal tests (what comes to mind?, sound pathways. Air conduction pathway (is water conduction an option for any mammals?) Sounds to head, to pinna of the outer ear, carried down. Vibration of tm, sets middle-ear bones in motion. These bones disturb fluid in cochlea of inner ear. Cochlea acts like a microphone turning mechanical energy into electrochemical code. Information sent to brain via auditory nerve (cranial #?)