Figure 2.

(A) Connectionist model for the T-maze task. Arrows represent excitatory connections and arcs ended with circles represent inhibitory connections between all pairs of integrator within a specific group (indicated by dashed rectangles). Each input, denoted I_n, relates to scenarios that the rat may encounter: I₁ straight corridor, I₂ dead end, I₃ right-hand bend, I₄ T-junction, I₅ left-hand bend. Actions that the rat can take are represented by: O₁ move straight ahead, O₂ turn around, O₃ right turn and O₄ left turn. The M₁ and M₂ integrators act as a working memory. (B) Geometry of the 2D virtual environment made up of 9 separate line segments. Initial position and orientation of the rat is shown. (C) Average % of successful trials with c (standard deviation as overall noise of all integrators) varied. (D) Average % of successful trials with standard deviation as leakiness of working memory integrators, k, is varied.