Figure 2.

Bisection with linearly spaced probe trials. A) Log ratio of the distance between the bisection point, B, and the geometric mean, GM, and the bisection point and the arithmetic mean, AM, as a function of spread (ratio of the reference durations). Values above zero are closer to the arithmetic mean, values below zero are closer to the geometric mean. B) Bisection normalized by the geometric mean of the reference durations as a function of spread. Regions marked by the gray box enlarged in the insert. Note that bisection is sub-geometric below log₂(spread) of 1. C) Bisection normalized by the arithmetic mean of the reference durations as a function of spread. Note that bisection becomes more sub-arithmetic with increasing spread. D) Bisection normalized by the arithmetic mean of the reference durations as a function of the arithmetic mean of the reference durations. Only experiments with a spread of 4 were used here. Bisection shows no correlation with absolute durations.