but the upper limit is not as clearly defined. The upper limit is more a question of the potential to cause noise-induced hearing loss. A more rigorous Psychoacoustics is the branch of psychophysics involving the scientific study of the perception of sound by the human auditory system. It is the branch of science studying the psychological responses associated with sound, including noise, speech, and music. Psychoacoustics is an interdisciplinary field including psychology, acoustics, electronic engineering, physics, biology, physiology, and comp T…

to young humans with healthy hearing. Hearing limits vary among individuals (e.g., with age or health) and differ widely across biological taxa. Fundamentals Sound is a phenomenon in which pressure disturbances propagate through an elastic material medium. In the context of physics, it is characterised as a mechanical wave of pressure or related quantities (e.g. displacement), whereas in physiological-psychological contexts it implies a hearing process. Though sensitivity to sound varies among all organisms, the human ear is sensitive to audio frequenc In physiology and psychology, the term sound refers to the perceptual experience produced by acoustic stimulation, distinguishing it from the physical definition used in acoustics. The field of psychoacoustics and the broader discipline of psychophysics study how organisms detect and interpret such stimuli. Webster's dictionary reflects this dual usage by defining sound both as "the sensation of hearing" and as the "vibrational energy which occasions such a sensation." This distinction explains why the question "if a tree falls in a forest and no one is around to hear it, does it make a sound?" can yield different answers depending on whether the physical or perceptual definition is applied. The physiological reception of sound in organisms with auditory systems is limited to a finite range of frequencies. In humans, sensitivity to pitch typically spans from about 20 Hz to 20 kHz, with the upper limit decreasing with age. Below about 20 Hz, periodic acoustic stimuli may be perceived not as pitch but as discrete pulses or slow amplitude fluctuations. The term sound is sometimes restricted to vibrations within the human hearing range, though other species exhibit markedly different auditory limits. For example, domestic dogs can detect frequencies above 20 kHz. As a signal perceived by one of the major senses, sound is used by many species for detecting danger, navigation, predation, and communication. Earth's atmosphere, water, and virtually any physical phenomenon, such as fire, rain, wind, surf, or earthquake, produces (and is characterized by) its unique sounds. Many species, such as frogs, birds, marine and terrestrial mammals, have also developed special organs to produce sound. In some species, these produce song and speech. Furthermore, humans have developed culture and technology (such as music, telephone and radio) that allows them to generate, record, transmit, and broadcast sound. Noise is a term often used to refer to an unwanted sound. In science and engineering, noise is an undesirable component that obscures a wanted signal. However, in sound perception it can often be used to identify the source of a sound and is an important component of timbre…