The difference between Si <> Se
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While Se attends to environmental details, Si is concerned with recalling or reconciling past details with those of the present.
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Se gathers concrete information broadly, seeking diversity and novelty. Si perceives more narrowly, drawing on past experiences.
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Se types are also more concerned with physical appearances.
Reference
Book: My True Type Clarifying Your Personality Type, Preferences & Functions Copyright © 2014 A.J. Drenth