RESUMOO paradigma da relação inversa velocidade-acurácia foi analisado em dois experimentos, através da lei de Fitts, em tarefas simuladas em computador. O experimento I analisou a tarefa de contornar figuras geométricas (triângulo, quadrado e círculo), manipulando o perímetro da figura e a espessura da linha e fornecendo índices de dificuldade (ID) entre 1,25 e 2,15 bits. O experimento II analisou a tarefa de traçar linhas, manipulando o comprimento, a espessura e o ângulo de inclinação da linha (0º, 45º, 90º, 135º e 180º), fornecendo IDs entre 3,5 e 7,5 bits. Uma regressão linear analisou a relação entre tempo de movimento (TM) e os IDs. Foram verificados coeficientes de determinação superiores a 0,9 (R 2 > 0,9) para a relação TM x ID no experimento I e II. Tais resultados forneceram suporte para a lei de Fitts no desempenho das tarefas simuladas em computador de contornar figuras geométricas e de traçar linhas. ABSTRACTSpeed-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 (0º, 45º, 90º, 135º, and 180º) 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.
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