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This Concept Map, created with IHMC CmapTools, has information related to: Sense of Hearing, requires power source like batteries or electricity hearing aid, medical intervention can either be repair, Suppression of unwanted sounds by active barrier, stethoscope vibrate air electronically requires power source, low tech vibrate air mechanically musical instruments, acted on directly by either strumming, Amplification can be high tech, percussion striking indirectly acted on indirectly, vibrating string can be either acted on indirectly, passive barrier examples include sound proofing, high tech vibrate air electronically musical instruments, percussion striking directly triangle, percussion striking indirectly key on piano, musical instruments can be 4 different types brass, percussion striking directly membrane of drum, cancels noise available as noise canceling headphones, repair with surgery tympanoplasty, Hearing is enhanced by medical intervention, requires power source like batteries or electricity stereo speakers, Suppression of unwanted sounds by passive barrier