Watch the Palm of Left-Hand online guitar lesson by Bruce Arnold from Guitar Physiology Survival Guide
The palm of your hand needs to remain in a consistent contour as you move across the neck. Don't try to keep the palm of your hand touching the neck as you move up a scale from the low strings to the high strings. This creates a situation where you are positioning your hand differently on each string. If you maintain the same shape in your palm as you play through each string you will only have to learn one physical movement for each finger.
When you move your palm into different positions your mind has to send different signals for each string; that's not what we are aiming for. There is an easy and low-tech solution for this problem. You can tape a wad of toilet paper into your palm to keep it in the proper position. Doing this for a few weeks usually solves this issue.