Treisman, A. M. (1960) Contextual cues in selective listening. Quarterly Journal of Experimental Psychology, 12(4), 242-248.
"In using the word “threshold” in this context, it is not necessarily meant to imply an intensity threshold, which might be one possibility, but simply that the unit is more or less likely to be activated by incoming signals, or that it is made more or less quickly available. Now if the selective mechanism in attention acts on all words not coming from one particular source by “attenuating” rather than “blocking” them, that is, it transforms them in such a way that they become less likely to activate dictionary units, it might still allow the above classes of words, with their thresholds which were originally exceptionally low, to be heard."
Treisman's "threshold" hypothesis and possibly the grandfather notion (threshold) of salience differences? (not sure but surely can be inferred from it.
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