New preprint with @andpru @paulgribble using @KINARMLab to go from feedback to feedforward control. #tweeprint below... 
(1/6)Many previous work have shown that learning new feedforward motor commands transfer to fast feedback responses (i.e. reflexes) to mechanical perturbations.
ncbi.nlm.nih.gov/pmc/articles/P…
ncbi.nlm.nih.gov/pmc/articles/P…
ncbi.nlm.nih.gov/pubmed/18923042
ncbi.nlm.nih.gov/pmc/articles/P…
ncbi.nlm.nih.gov/pmc/articles/P…
ncbi.nlm.nih.gov/pmc/articles/P…
ncbi.nlm.nih.gov/pubmed/18923042
ncbi.nlm.nih.gov/pmc/articles/P…
(2/6)Whether this transfer take place from feedback responses to feedforward control is currently unknown as it is hard to elicit learning in reflexes without engaging associated voluntary responses.
(3/6) This transfer from feedback to feedforward control can be predicted from the view that these 2 processes share common neural circuits but it could very well be that one always need to train feedforward control directly for it to change.
(4/6)Here we approached this question by combining paradigms to elicit and alter reflex responses to mechanical perturbations with shoulder fixation (altered arm dynamics) while minimizing the participation of voluntary responses in the learning process.
(5/6)We found a reduction in shoulder feedback responses with shoulder fixation, and after learning, we found a reduction in shoulder muscle activity during elbow reaching (feedforward) even tough participants never practiced reaching with shoulder fixation
(6/6) Thus transfer between feedforward and feedback control is bidirectional, furthering the notion that these processes share common neural circuits that underlie motor learning and transfer. Thanks for reading! We appreciate any comments, suggestions...
