Bidirectional transmission in the cerebrobuccal connective of Aplysia during feeding

The neuronal activity of the cerebrobuccal connective (CBC) of Aplysia was recorded, using 2 implanted electrodes, under three conditions; 1) in the absence of feeding behaviour, 2) during appetitive feeding behaviour and 3) during consummatory feeding behaviour. Cross-correlation analysis of the recordings was then performed to subdivide spikes on the basis of their direction and speed of propagation. This revealed differences in the neuronal activity during the 3 conditions. There was little activity in the CBC when animals were not feeding. During appetitive and consummatory feeding behaviour the activity in the CBC increased. Units travelling in each direction were present, but with differential activity during the 2 behavioural patterns.