Fig. 5.

Summary of Minini's and Jeffery's experimental design and results. (A) The triangle vs. square discrimination in which rats were trained in one of Minini's and Jeffery's experiments. (B) Rat discrimination performance for different kinds of manipulations of the originally learned patterns (shown below the abscissa axis). Manipulations altering the relative brightness of the stimuli in the lower hemifield of the stimulus display made rat performance falling to chance (dashed line) or below it (see Section 4.4 for details).

Modified from Minini and Jeffery [146].