I made Stage 3 functional with the help of an electrical stimulation device called NeuroMove which has a biofeedback component and a spring-loaded hand splint called SaeboFlex. They helped me retrain my brain to open my hand a few inches so it can receive an object from my sound hand. Hand-to-hand transfers let my affected hand hold an object close to my body so my sound hand can manipulate the object. Hand-to-hand transfers made me independent in over 30 bimanual tasks like taking the cap off a deoderant bottle.
Stage 4 brings shoulder, elbow, and forearm motions that move the hand farther away from the body. Keeping a hand open while reaching for an object is a skill able-bodied people use thousands of times. My emerging Stage 4 skills are: 1) keeping my hand open when I reach at waist height while standing and 2) partially rotating my forearm to orient my hand to the different positions objects require. My hand is still synergy bound so I cannot open my hand unless I also move my shoulder.
Stage 5 means you can move one joint without moving all the other joints in a limb. I was stunned to learn my hand is useful without achieving Stage 5. As an OT I knew stroke survivors walk using the extension synergy in the leg, but I was taught the flexion synergy in the arm is bad. I had to have a stroke to see the flexion synergy in the arm in a more positive light. homeafterstroke.blogspot.com