A single process involved in motor learning is adaptation. Hand reaching movement has been extensively used to evaluate the concept of motor adaptation. By inducing a systematic perturbation on the hand, it is possible to examine the implicit motor response on the trajectory of the hand. Error-augmentation (EA) training is relatively new concept in motor learning intended to promote the adaptation process. Applying these perturbating forces on the hand shift the hand trajectory form the straight line to a curve like shape. Making repetitive movement under the same conditions will results in a gradual correction of this faulty movement trajectory toward the straight line, e.g. motor adaptation.