Editing Perception (section)

=== Sound ===
[[File:Anatomy of the Human Ear en.svg|right|thumb|Anatomy of the human ear. (The length of the auditory canal is exaggerated in this image.){{Anatomy of the human ear - color legend}}]]
[[Hearing]] (or ''audition'') is the ability to perceive [[sound]] by detecting [[vibration]]s (i.e., ''sonic'' detection). Frequencies capable of being heard by humans are called [[Audio frequency|''audio'' or ''audible'' ''frequencies'']], the range of which is typically considered to be between 20&nbsp;[[Hertz|Hz]] and 20,000&nbsp;Hz.<ref>{{cite web
| url=https://hypertextbook.com/facts/2003/ChrisDAmbrose.shtml
| title=Frequency range of human hearing
| first1=Christoper
| last1=D'Ambrose
| year=2003
| first2=Rizwan
| last2=Choudhary
| website=The Physics Factbook
| editor-last=Elert
| editor-first=Glenn
| accessdate=2022-01-22
}}</ref> Frequencies higher than audio are referred to as [[Ultrasound|''ultrasonic'']], while frequencies below audio are referred to as [[Infrasound|''infrasonic'']].

The [[auditory system]] includes the [[Ear|outer ears]], which collect and filter sound waves; the [[Ear|middle ear]], which transforms the sound pressure ([[impedance matching]]); and the [[Ear|inner ear]], which produces neural signals in response to the sound. By the ascending [[auditory pathway]] these are led to the [[primary auditory cortex]] within the [[temporal lobe]] of the human brain, from where the auditory information then goes to the [[cerebral cortex]] for further processing.

Sound does not usually come from a single source: in real situations, sounds from multiple sources and directions are [[mwod:superimpose|superimposed]] as they arrive at the ears. Hearing involves the computationally complex task of separating out sources of interest, identifying them and often estimating their distance and direction.<ref name="eop_constancy" />