Relação velocidade-acurácia em tarefa de contornar figuras geométricas e traçar linhas

Abstract

Speed-accuracy trade-off was analyzed in two experiments, through Fitts' law, in tasks simulated by computer. Experiment I analyzed the task of drawing geometric figures (triangle, square, and circle), in which it figure perimeter and line thickness were manipulated, providing index of difficulties (ID) between 1,25 and 2,15 bits. Experiment II analyzed the task of trace lines, in which it line size, line thickness, and line inclination angle (0°, 45°, 90°, 135°, and 180°) were manipulated, providing IDs between 3,5 and 7,5 bits. A linear regression analysis was used to evaluate the relationship between movement time (MT) and task's ID. Determination coefficients higher than 0,9 (R2 > 0,9) for the association TM x ID in experiments I and II were verified. Such results provided support for Fitts' law on the performance of the computer simulated tasks of drawing geometric figures and trace lines.