We report the global features of recently observed results of phase lead phenomena of human hand-tracking experiments, i.e. the hand motion precedes the target motion in the frequency range 0.4Hz<f<1.7Hz, and the amount of precedence approximately corresponds to the value for which the amount of the error of the hand position occurring at sudden frequency change of the target motion is minimum. A delayed feed-forward model with a properly chosen value of a feed-forward parameter roughly reproduced the two main features of the experimental results simultaneously. These results suggested that the phase in the human percepto-motor control system might be chosen to an operational point to minimize the transient error in a certain frequency range determined by physical parameters.