![]() ![]() The graphic representation of the sensitivity is an audiogram. The normal range of human hearing is called audiometry, and The clinical procedure in which auditory sensitivity is tested over (Licklider JCR: Basic correlates of the auditory stimulus. Labeled "lab" is the clinical threshold of hearing curveįor a normal human the "office" threshold of hearingĬurve presented to show the effect of room noise on auditory threshold. The upper curve shows the threshold of pain for differentįrequencies ("feeling"). Most sensitive to sounds in the range of frequencies used by human spoken language, i.e., in the range fromįig. Of the ear varies with frequency, being less sensitive at very low and very high frequencies and ![]() Perceived loudness is actually a function of both frequency and amplitude because the sensitivity Same time, a change in size or amplitude of the vibration is perceived as a change in loudness. (Hz = cycles/sec) to 20,000 Hz into nervous impulses, allowing the human to distinguish smallĬhanges in frequency as changes in pitch-the higher the frequency, the higher the pitch. It transduces sounds of frequencies from 20 Hertz (this may come at some cost as we shall see). Structured in such a way that it can withstand sound so intense that it vibrates the whole body Of the air as small as 10 -8 centimeters (the diameter of a hydrogen ion is 2 x 10 -8 cm), yet the ear is Highly sensitive mechanoreceptors in the ear are capable of sensing amplitudes of vibrations Impulses to the central nervous system the result is what we call hearing. Of the air, transduce them into nervous impulses, encoding important features, and transmit the The ear is a structure specialized to receive these vibrations Sound waves, unlike light,Ĭannot travel through a vacuum, but require some medium, gaseous, liquid or solid, each medium Transmitted in a straight line through the air at a characteristic speed. This sequence of compressions and rarefactions is The object moves in the direction of an observer, it compresses the air and when it movesĪway, it produces a rarefaction. An object vibrating in air sets up motion of the molecules in the air around it so that when
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