Disruptions in the reach-to-grasp actions of Parkinson's patients

There was an error in the curvature equation on page 355. The variables are properly defined in the text, but in the formula above the text, the first derivative of X and Y position are not superscripted in either the numerator or denominator. The correct equation is given below: where: x′=first time derivative of x position, y′=first time derivative of y position, x′′=first time derivative of x position, y′′=first time derivative of y position.