Generality of Fitts' Law under Differential Error Instruction

This experiment examines the applicability of Fitts' “channel capacity” model for discrete motor movements in a situation where the error rate (missing the target) is substantially increased and the resulting movement time decreased. Two experimental groups averaged approximately 3% and 19% error but yielded essentially the same information transmission rate in bits pet second. The generality of the law over a wide error range is therefore indicated.