The ability to detect and avoid predators is essential to survival. Various animals, from sea urchins to damselfly larvae, use injury of conspecifics to infer the presence of predators. In many fish, skin damage causes the release of chemicals that elicit escape and fear in members of the shoal. The chemical nature of the alarm substance ("Schreckstoff" in… (More)
High-resolution tracing of projections from the olfactory bulb to its cortical targets revealed coarse topography and stereotopy in some areas but highly distributed, combinatorial connectivity in others. These results provide a basis for understanding innate and associative olfactory processing and perception.
A recent study in Drosophila has found that the connectivity between the first olfactory processing center, the antennal lobe, and one of its targets, the mushroom body, is apparently random. This supports the idea that the mushroom body is designed for learning arbitrary odor features.