I came across a bass lesson of Luke Macintosh on effortless intonation (well: who does not dream about that?): Effortless Intonation - Lesson 1 - Become A Bassist. See also . His basic idea is: when a tone is false, one should not shift the entire hand, nor expand or extract the hand. But one should raise or lower one´s elbow and pivot around the left thumb in order to change the placement of the fingers. So: if a tone is too hight, you raise the left elbow, and make your left hand lower along the strings by pivoting around the thumb. If a tone is too high, you lower the elbow and pivot around the thumb, so that your fingers go a bit upward. Please see the video if I am not clear. This seems strange to me. I subscribe to Luke's idea that a movement should start with the larger muscles. So a correction of the intonation should not come from expansion or contraction. But I should think that a note should be lowered by lowering the entire hand a tiny bit, controlling the movement from the upper arm to the fingers, and not by using arm and elbow as a hinger. I am curious how the teachers in this forum look to this matter.