The eight-arm radial water maze is designed to evaluate reference and working memory performance simultaneously by requiring subjects to use extra-maze cues to locate escape platforms and remedies the limitations observed in land based radial arm maze designs.
Penley, S. C., Gaudet, C. M., Threlkeld, S. W. Use of an Eight-arm Radial Water Maze to Assess Working and Reference Memory Following Neonatal Brain Injury. J. Vis. Exp. (82), e50940, doi:10.3791/50940 (2013).