Editing Psychophysics (section)

===Detection===
An absolute threshold is the level of intensity at which a subject can detect the presence of a stimulus a certain proportion of the time; a {{math|''p''}} level of 50% is commonly used.<ref>John Krantz. [http://www.saylor.org/content/krantz_sensation/Experiencing_Sensation_and_Perception.pdf "Experiencing Sensation and Perception"] {{Webarchive|url=https://web.archive.org/web/20171117002814/http://www.saylor.org/content/krantz_sensation/Experiencing_Sensation_and_Perception.pdf |date=2017-11-17 }}. pp. 2.3–2.4. Retrieved May 29, 2012.</ref> For example, consider the absolute threshold for tactile sensation on the back of one's hand. A participant might not feel a single hair being touched, but might detect the touch of two or three hairs, as this exceeds the threshold. The absolute threshold is also often referred to as the ''detection threshold''. Various methods are employed to measure absolute thresholds, similar to those used for discrimination thresholds (see below).