Fig. 10.

The monosynaptic component of the PSP produced in the gill motor neuron LDG1 by water-movement stimulation of the siphon during habituation and dishabituation training. The abdominal ganglion was perfused with seawater containing elevated concentrations of Ca²⁺ and Mg²⁺, which blocks most of the polysynaptic component of the PSP. A, Records from a representative experiment showing the PSP in Hi Ca²⁺, Hi Mg²⁺ seawater during habituation and dishabituation.B, Average results from 10 experiments like the one shown in A. The area under the PSP was measured during the first 1.4 sec after the start of the PSP and was normalized to the value on trial 1 in each experiment (the average value on trial 1 was 3690 mVmsec).