ABSTRACT
The macrolevel and microlevel analysis of the orienting response (OR) in man and vertebrates has already been discussed and this chapter now describes studies using single unit recording in the snail. In the central nervous system of the snail, neurons have been found that demonstrate three basic properties of the OR-habituation (extinction), dishabituation, and a selective trace that can be compared with the neuronal model postulated in vertebrates. What additional information can be found in such experiments? The most important information concerns the synaptic organization of all these processes, assuming that in this there is similarity between vertebrates and invertebrates.
