The shuttle box apparatus with propeller controller in the upper left-hand corner. In this image, one of the plexiglass covers (A) has been removed so that the shock grid can be seen more easily. In the experiments, one cricket was placed into the compartment labeled A and one cricket was placed into the compartment labeled B. A piece of filter paper was placed under the left-hand side of the shuttle box to illustrate the midpoint for the two halves of the compartment. Once the cricket was inside the compartment, the plexiglass was placed over the compartment to ensure that the cricket maintained contact with the grid.