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Two major factors influence the opening of critical periods: cellular events (i.e. changes in molecular landscape) and sensory experience (i.e. hearing sound, visual input, etc.). Both need to coincide for the critical period to open properly. At the cellular level, critical periods are characterized by maturation of the inhibitory circuits. [9]
The theory has often been extended to a critical period for second-language acquisition (SLA). David Singleton states that in learning a second language, "younger = better in the long run", but points out that there are many exceptions, noting that five percent of adult bilinguals master a second language even though they begin learning it when they are well into adulthood—long after any ...
This is a list of such named time periods as defined in various fields of study. These can be divided broadly into prehistorical periods and historical periods (when ...
Some of the most pervading examples of this can be seen through the development of the visual cortex in addition to the acquisition of language as a result of developmental plasticity during the critical period. [8] [32] A lesser known example, however, remains the critical development of respiratory control during developmental periods. At ...
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The perinatal period (from Greek peri, "about, around" and Latin nasci "to be born") is "around the time of birth". In developed countries and at facilities where expert neonatal care is available, it is considered from 22 completed weeks (usually about 154 days) of gestation (the time when birth weight is normally 500 g) to 7 completed days ...
When proximity during this critical period does not occur—for example, where a brother and sister are brought up separately, never meeting one another—they may find one another highly sexually attractive when they meet as adults. [19] This phenomenon is known as genetic sexual attraction.
Kairos (Ancient Greek: καιρός) is an ancient Greek word meaning 'the right or critical moment'. [1] In modern Greek, kairos also means 'weather' or 'time'. It is one of two words that the ancient Greeks had for 'time'; the other being chronos (χρόνος).