![]() Other types of hearing tests also generate graphs or tables of results that may be loosely called 'audiograms', but the term is universally used to refer to the result of a PTA hearing test.Hearing assessment Apart from testing hearing, part of the function of audiometry is in assessing or from the test results. A PTA hearing test is the gold standard for evaluation of hearing loss/disability. Main article:The result of most audiometry is an audiogram plotting some measured dimension of hearing, either graphically or tabularly.The most common type of audiogram is the result of a pure tone audiometry hearing test which plots frequency versus amplitude sensitivity thresholds for each ear along with bone conduction thresholds at 8 standard frequencies from 250 Hz to 8000 Hz. This stimulates the sensory cells of the organ of Corti, atop the basilar membrane, to send nerve impulses to the central auditory processing areas of the brain, the, where sound is perceived and interpreted.Sensory and psychodynamics of human hearing Non-linearity. The motion of the stapes against the oval window sets up waves in the fluids of the cochlea, causing the basilar membrane to vibrate. Main article:Sound waves enter the outer ear and travel through the external auditory canal until they reach the tympanic membrane, causing the membrane and the attached chain of auditory ossicles to vibrate. The first commercial system for detecting and measuring OAEs was produced in 1988.Auditory system. Also coined the term “audiogram” at that time.With further technologic advances, bone conduction testing capabilities became a standard component of all Western Electric audiometers by 1928.Electrophysiologic audiometry In 1967, Sohmer and Feinmesser were the first to publish ABRs recorded with surface electrodes in humans which showed that cochlear potentials could be obtained non-invasively.Otoacoustic audiometry In 1978, David Kemp reported that sound energy produced by the ear could be detected in the ear canal. ![]() First employed frequency at octave intervals plotted along the abscissa and intensity downward along the ordinate as a degree of hearing loss. ![]()
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