Figure 3
From: Axes of self-motion and object motion shape how we perceive world-relative motion

Illustrations of the variables in the flow parsing gain calculation. Left panel: parallel motion. Right panel: orthogonal motion. Participant moves from A to B, while the target started at C and moved towards E. D is the point of subjective equality (PSE), i.e. when the target moves from C to D, it is perceived as stationary on the given axis. Flow parsing gain g is obtained by \(g=\frac{\beta }{\alpha }\). Only two examples of forward locomotion are shown in this figure.