Among the internal cadences in the third duet are a pair that neatly illustrate my point today. In two of the three pieces by Lassus (from parts 2-4 in this series of posts), the voices largely approached the cadence in the same direction—up, of course, since I was bringing out the historically significant idea of rising cadence gestures.
Contrary motion is entirely possible, too: in the cadence pair below, the 3-1 is approached in a closing wedge, 6-8 in one that opens. Both express broadly basic motion in each of the cadences: 3 closing into 1, 6 opening out to 8.
It is important to note, however, that there is in fact no necessary directional bias in either of the two cadence types, 3-1 and 6-8. Subsequent posts will attempt to make that clear.