Figure 2.

Development of direction selectivity in the retinotectal circuit model. A, Time profiles of the total inputs to the centered TN evoked by bars moving in four orthogonal directions as a test stimulus before (dashed lines) and after (solid lines) training (one trial). B, C, Percentage changes in the integrated total input (time integration of total input) in each direction through training during the simulation (average of 5 trials ± SEM) (B) and during an experiment (mean ± SEM) (Engert et al., 2002) (C) (reproduced with permission from Nature).