A young chaffinch must hear an adult singing before it sexually matures, or it will never properly learn the highly intricate song.
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Barry had initially found it difficult to believe in her acquisition of stereo vision for the reason that the notion of critical period was firmly set since the groundbreaking work of Torsten Wiesel and David H. Hubel with deprivation experiments in which animals did not develop the neuronal basis for stereo vision if they were prevented from performing stereo fusion for a given time period after birth.
Recently, doubts have arisen concerning the validity of this critical period hypothesis with regard to visual development, in particular since the time it became known that neuroscientist Susan R. Barry and others have achieved stereopsis as adults, long after the supposed critical period for acquiring this skill.
He retired to Chambly, a little town near his native place, where he remained during the most critical period of the Revolution.
He was born in Talwandi (a village in the Punjab) in 1469 at a critical period of Indian history.
On 8 March 2009 Mike Whitney was inducted as a life member by the South Sydney Rabbitohs for his contribution in being a Director on the Football Club Board in the critical period during the Club’s battle for reinstatement to the competition between 1999 and 2001.
He initially secured a post in the civil service, and held important appointments under the Angelos emperors (among them that of Grand Logothete or Chancellor) and was governor of the theme of Philippopolis at a critical period.