My interests include single-unit recording in the CA1/3 region of the hippocampus, the entorhinal cortex and the postsubiculum in both rats and mice. A continuing research strand is focused on how the hippocampus represents context and how this interacts with learning about an environment. Traditionally, single-unit recordings (and most behavioural work with rodents) have focused on flat, horizontal, planar environments yet we live in a complex, three-dimensional world. To try and understand how the brain might go about encoding and representing such a complex world I have become interested in both the behaviour and neural correlates of animals moving through three-dimensional environnments. How do animals navigate over such topologically complex surfaces? How does moving vertically affect the activity of "place" and "grid" cells and how is height coded by these cell populations?