Performance metrics of simulated male moths seeking a pheromone source: variation with memory timescale, τ, and plume-crossing probability, P
. Data and simulation parameters are as in Figure 7. Left: Search success probability, P
; middle: time-based efficiency, E
; right: distance-based efficiency, E
. In all three plots, the horizontal axis represents memory timescale parameter, τ, and the vertical axis represents the plume-crossing probability, P
. Note that success probabilities are maximized by intermediate values of P
. Both efficiency metrics are maximized by lower values of this parameter. Longer memory timescales (higher values of τ) broaden the range of P
corresponding to good source location performance, as indicated by all three metrics.