Table 5 Description of performance metrics

Bits/second

Index of performance, information transfer rate given through Fitts’ law (eq. (3)).

%

Ratio of Euclidian distance between the origin and the target center to the actual distance the cursor travelled.

%

Ratio of successfully completed targets to total number of targets.

%

Ratio of overshoots to number of targets. An overshoot was defined by a cursor entry into and exit of the target circle before the dwell time was accomplished.

Seconds

Time between target appearance and first move of the cursor.