Figure 1. The effortful t-maze.

The t-maze (A) was equipped with one start arm and two goal arms, each baited with either a high reward, HR (4 1/2 froot loops) or a low reward, LR (1/2 froot loop). Wooden blocks (B) of varying heights 15, 20, 25, and 30 cm were used to increase the effort required to access the high reward arm.