Northfield, Vermont is a community of 6207 people (2010 Census) located in the heart of Vermont's Green Mountains. Home to Norwich University, the oldest private military college in the United States, Northfield is an easy ten-mile drive from Montpelier, the state's capital, and three hours from either Boston or Montreal.
Ceci introduced in 1990 his Bio-Ecological Theory of Intelligence, which holds that the level of mental activities or IQ are dependent on context. For example, he says traditional conceptions of intelligence ignore the role of society in shaping intelligence and underestimate the intelligence of non-Western societies.
Later extensions of the model are detailed in McGrew (2011) and Schneider and McGrew (2012) There are a fairly large number of distinct individual differences in cognitive ability, and CHC theory holds that the relationships among them can be derived by classifying them into three different strata: stratum I, narrow abilities; stratum II, broad abilities; and stratum III, consisting of a single general ability (or g).