Perceiving functions are actually the only way to generate information. They unconsciously take data from the world and combine it with internal sources of information to generate a stream of perception that's passed to the judgment functions. Judgment functions label the information, weigh it, throw some of it out, etc. But there can be no "leaps" in judgment functions -- they decide their conclusions based deterministically on a defined metric. With no leaps, there'd be no new information. That's why there's always an interplay between judgment and perception -- perception is necessary to change scope, broaden context, etc. and judgment is needed to flesh out whatever framework perception has defined.