Effect of external versus internal focus instruction on reach-to-grasp kinematics and coordination in overhand and underhand trials. Graphs show mean and SEM for (a) normalized total movement time (TMT), (b) average peak reach velocity (pRV), (c) normalized time-to-peak grasp aperture (TpGA), and (d) average time-lag (T-Lag). *Results show a significant main effect of instruction, indicating a detrimental effect of internal focus instruction. **Results show a significant main effect and interaction between instruction condition and group, indicating that the TpGA delay with internal focus instruction was significantly greater for individuals with LHD.