I am sorry, but the paper

  A.D. Redish, D.S. Touretzky (1994) 
  "The Reaching Task: Evidence for 
  vector subtraction in the motor system?", 
  Biological Cybernetics,  71(4): 307-317. 

is unavailable due to copyright restrictions.  
Reprint requests can be sent to me.
Again, I regret the inconvenience.

David Redish