You really will need to screw with your therapists mind and deliberately fail in your exercises because that will allow you to learn faster. Practice falling, that will do the job. You will need to ask your doctor if this error memory part of your brain was damaged in your stroke. They will sputter and deflect and not answer the question.
http://www.sciencemag.org/content/345/6202/1306.8.short
How do we learn from past errors? Herzfeld et al.
found that when we practice a movement, the human brain has a memory
for errors that is then used to learn faster in new
conditions. This memory for error exists in
parallel with motor memory's two traditional forms: memory of actions
and memory
of external perturbations. They also proposed a
mathematical model for learning from errors. This model explained
previous
experimental results and predicted other major
findings that they later verified experimentally.
Science, this issue p.
1349
