Figure 4. Probability of Reach, P, as a function of noise amplitude, D, for various values of stimulus duration, T.

P is zero for very low values of D: since the stimulus amplitude, A ₀, is subthreshold, a minimum level of noise is necessary for a successful reach. Beyond D = 4, P decreases slowly with increasing D. Corresponding to each value of T, there is a thin solid line and a thick dashed line. The solid line represents the original simulation result, and the dashed line is the smoother version of the same.