Silver,
Thanks for posting. Appreciate your clarification of the subject. LaFontaine, I believe, was a practitioner who well understood the concept.
For example, in one of his books, he says: "It's the first strong visual characteristic, the one triggering the trout's decision to take a natural or an imitation, that is critical. This feature varies even with different stages of the same insect, such as a mayfly, and the matching fly must have it."
Many great fishers, including Gary Borger, promote the "exaggerated trigger". For example, if trout are selectively taking a certain adult, floating dun, they would argue fishing a matching pattern with oversized wings Might be fruitful due to the fact that the wings are the first characteristic coming into the trout's window of vision.....and they are looking for the distinctive wings.
From LaFontaine's "Dry Flies - New Angles":
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