M.R. Lamprea, F.P. Cardenas, J. Setem and S. Morato. Thigmotactic responses in an open-field. Braz J Med Biol Res 2008; 42: 135-140.
Figure 1. Diagram of the open-field. Each line is 20 cm long and the digit inside the divisions indicates the number of walls surrounding it. B indicates the location where the blocks were placed. For details, see text.