The Antarium: A Reconstructed Visual Reality Device for Ant Navigation Research.

We constructed a large projection device (the Antarium) with 20,000 UV-Blue-Green LEDs that allows us to present tethered ants with views of their natural foraging environment. The ants walk on an air-cushioned trackball, their movements are registered and can be fed back to the visual panorama. Views are generated in a 3D model of the ants' environment so that they experience the changing visual world in the same way as they do when foraging naturally.

The role of attractive and repellent scene memories in ant homing ().

Solitary foraging ants rely on vision when travelling along routes and when pinpointing their nest. We tethered foragers of on a trackball and recorded their intended movements when the trackball was located on their normal foraging corridor (on-route), above their nest and at a location several metres away where they have never been before (off-route). We found that at on- and off-route locations, most ants walk in the nest or foraging direction and continue to do so for tens of metres in a straight line.

Microvascular pathology in the aging human brain: evidence that senile plaques are sites of microhaemorrhages.

Amyloid-rich plaques are a feature of the aging human cerebral cortex. We have recently described another feature of aging human cortex, microhaemorrhages, identified by their content of haem, red blood cells, collagen and clotting factors, and their spatial relationship to capillaries. Here we relate microhaemorrhages to amyloid deposits.

Pericapillary haem-rich deposits: evidence for microhaemorrhages in aging human cerebral cortex.

In this post mortem study, we examined haem-rich deposits (HRDs) in patients with and without dementia, using a histochemical label (Prussian blue) to show haem, autofluorescence to detect red blood cells (RBCs), and immunohistochemistry for clotting-related factors and collagen IV. The patients studied had no clinical or post mortem evidence of macrovascular stroke. To allow examination of the spatial relationships between HRDs and the microvasculature, we cut 45-microm sections.