Fig. 12.

a, 3D best direction of each unit versus their locations in deltoid, for each subject. The best direction is given by the direction of the unit vector from the origin. The color of the vector codes for location. As location changes from posterior to anterior (and color changes from the blue to thered end of the spectrum), best direction changes from down–out–backward to up–out–forward. b, Pooled 3D best directions of all units versus their normalized locations in deltoid, for all subjects. Best directions are coded for location as ina.