Timing precision in LHT: Weber functions. Mean standard deviation of timed responses (σ ± SEM) as a function of mean timed response (μ ± SEM). The solid lines are best fits of the Generalized Weber's Law with Weber fraction w (but not constant error c) varied across strains. A model-comparison analysis selected the varied parameter. The larger value of wLE is evidenced by the steeper slope of its Weber function; it is indicative of lower precision in timing.