Editing Phase response curve (section)

=== Origin ===
The first published usage of the term "phase response curve" was in 1960 by [[Patricia DeCoursey]]. The "daily" activity rhythms of her [[flying squirrel]]s, kept in constant darkness, responded to pulses of light exposure. The response varied according to the time of day – that is, the animals' subjective "day" – when light was administered. When DeCoursey plotted all her data relating the quantity and direction (advance or delay) of phase-shift on a single curve, she created the PRC. It has since been a standard tool in the study of biological rhythms.<ref>{{cite web |title=Clock Tutorial #3c - Darwin On Time |url=http://scienceblogs.com/clock/2007/08/clock_tutorial_3c_darwin_on_ti.php |access-date=2007-11-03 | vauthors = Zivkovic B |year=2007 |work=A Blog Around the Clock |publisher=ScienceBlogs LLC |archive-url=https://web.archive.org/web/20120519024856/http://scienceblogs.com/clock/2007/08/clock_tutorial_3c_darwin_on_ti.php |archive-date=2012-05-19 |quote=[The PRC is] the single most important methodological tool in the study of all [[biological rhythm]]s. |url-status=dead }}</ref>