(A and B) Early adaptation models by Malcolm and Jones, 1970 [22] (A) and Young and Oman, 1969 [21] (B) used a single feedforward or feedback adaptation integrator, respectively.
(C) Furman et al., 1989 [23] incorporated the central “velocity storage” mechanism into the model.
(D) Our new model builds on two new ideas: (1) adaptation operators are variably leaky integrators (modifiable leak and time constant parameters), and (2) there are multiple adaptation operators with progressively different dynamics (Ta3 > Ta2 > Ta1).
See also Figures S3 and S4 and Table S1.