I was an INFJ and now I'm curious as to what an EN is?
The preferences for extraversion (thus spelled in Myers-Briggs jargon) and introversion are sometimes referred to as attitudes. Briggs and Myers recognized that each of the cognitive functions can operate in the external world of behavior, action, people and things (extraverted attitude) or the internal world of ideas and reflection (introverted attitude). The Myers-Briggs Type Indicator sorts for an overall preference for one or the other of these.
The terms extravert and introvert are used in a special sense when discussing the Myers-Briggs Type Indicator. People who prefer extraversion draw energy from action: they tend to act, then reflect, then act further. If they are inactive, their level of energy and motivation tends to decline. Conversely, those who prefer introversion become less energized as they act: they prefer to reflect, then act, then reflect again. People who prefer introversion need time out to reflect in order to rebuild energy.
The extravert's flow is directed outward toward people and objects, and the introvert's is directed inward toward concepts and ideas. There are several contrasting characteristics between extraverts and introverts: extraverts are action-oriented and desire breadth, while introverts are thought-oriented and seek depth. Extraverts often prefer more frequent interaction, while introverts prefer more substantial interaction.http://en.wikipedia.org/wiki/Myers-Briggs_Type_Indicator