p214fig05.24 Learning of a top-down expectation must occur during bottom-up learning in the adaptive filter in order to be able to match the previously associated feature pattern with the one that is currently active.<BR>||  Learning top-down expectations. When the code (green right triangle GRT) for X1 was learned at F2, GRT learned to read-out X1 at F1. [Bottom-Up, Top-Down] learning