Schematic presentation of the neural circuitry underlying taste aversion training in the <i>Lymnaea</i> CNS.

<p>The signals of the CS and US are associated in the CGC. Rectangles and circles indicate interneurons and motor neurons, respectively. At synapses, open circles and closed circles indicate excitatory monosynaptic inputs and inhibitory monosynaptic inputs, respectively. The N1M, N2 and N3t cells form part of the feeding CPG. The EPSPs recorded in the B1 and B3 motor neurons can be used for monitoring the changes in the synaptic connections of CGC-N3t and N3t-N1M, respectively.