Fig. 5. Conditioning Helix to carrot or potato changes the responses recorded in the peritentacular nerves in an isolated tentacle/ganglion preparation. Snails were presented with either carrot (i) or potato (ii) and allowed to feed. (A) Naïve snails; (B) carrot-conditioned snails; (C) potato-conditioned snails. The extracellular recordings of nerve activity show increased activity when the odour of their food was blown across the tentacle. Reproduced from Peschel et al. (1996) with permission.