Alright, I figured it out.
Aside from the sensor for each gate, there is a sensor in the center of each neutral position. If you take it out of gear straight up or down to the neutral position directly above or below the gate then the revs will hold where they are or fall slightly. If you move it from that neutral position to a neutral position further left then it will blip.
The easiest way to test it is to drive in 5th at a steady speed of 45-60 and drop it down to neutral above the various gates. If you drop it to neutral and let go, the spring will center it above 4th so the engine blips in anticipation. If you push it to the left the engine really blips thinking that you might stick it in 2nd. If you drop it out of gear but hold it to the right the engine doesn't blip at all.
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