Fig. 3.

Strategy-based enhancement of stimulus features. During the training, individuals are presented with an experimental stimulus (left), which is processed as described in Fig. 1, producing a cognitive representation based on an individual heuristic (right). In this particular example (based on the analysis of pigeon P15), decisions on whether to peck on the stimulus are based on its rightmost part (inflated in the figure), and the transitions between contiguous squares (enhanced).