Copyright © American Speech-Language-Hearing Association From: Ramp-and-Hold Force Control in the Upper and Lower Lips:  Developing New Neuromotor Assessment Applications in Traumatically Brain Injured Adults J Speech Hear Res. 1990;33(4):660-675. doi:10.1044/jshr.3304.660 Legend: The peak rate of force change, derived from the maxima of the first derivative offeree (dF/dtmax), versus target force for the upper lip and lower lip in male (N = 20) and female (N = 20) adult subjects. Parameters of simple linear regression, including the t ratio for the coefficient of slope, are given for each distribution. Solid lines correspond to the predicted Y value as a function of target force. The intrinsic error is given by ei for all regression plots. Dotted lines indicate the 99% confidence intervals for the mean based upon data from 20 normal adults. Date of download: 12/18/2017 Copyright © American Speech-Language-Hearing Association