University College London researchers have discovered that the brain lays out a grid of cells that represent a map of spacial orientations and locations in space. That in itself may not be any big news to most readers – “so what?” This grid has been known to exist in mice since 2005.
Well, the cool thing is that this 3D grid within the hippocampal formation and associated brain areas, now discovered to exist in humans as well, forms triangles in hexagonal formations – sort of like a honeycomb. Study co-author Dr Caswell Barry said: “It is as if grid cells provide a cognitive map of space. In fact, these cells are very much like the longitude and latitude lines we’re all familiar with on normal maps, but instead of using square grid lines it seems the brain uses triangles.”
In an interesting coincidence, the Rapid Eye Technology (RET) eye directing device (called a wand) is moved in a hexagonal 3D pattern just in front of the face – a pattern that due to its spacial character may be very familiar to the aforementioned part of the brain. Further, the signals flowing through the brain from eyes to visual cortex stop off for an emotional load at the hypothalamus which is attached to the memory-gating hippocampus – the seat of this honeycomb-like spacial mapping grid.
Research team leader, Professor Neil Burgess, commented, “…grid cells may help us to find our way to the right memory as well as finding our way through our environment. These brain areas are also amongst the first to be affected by Alzheimer’s disease which may explain why getting lost is one of the most common early symptoms of this disease.”
