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. 1998 Jan 1;18(1):458–466. doi: 10.1523/JNEUROSCI.18-01-00458.1998

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Fig. 4. — Postsynaptic BAPTA or postsynaptic hyperpolarization during training reduce pairing-specific facilitation but not facilitation by unpaired training or by 5-HT.A–C, Effect of postsynaptic BAPTA on facilitation induced by paired presentation of a tetanus (arrow) and 5-HT (large open triangle) (A), by unpaired training (B), and by 5-HT (C). The 5-HT alone and 5-HT/BAPTA results are from the second sensory neuron in the same culture that did not receive tetanic stimulation and are pooled from both paired and unpaired training groups. Average EPSP amplitudes on trial one, 30 min after impalement, were 14.3 ± 1.5 mV (control), 18.2 ± 2.0 mV (paired), 14.9 ± 1.5 mV (paired/BAPTA), 13.3 ± 1.5 mV (unpaired), 21.5 ± 3.3 mV (unpaired/BAPTA), 20.1 ± 1.9 mV (5-HT), and 20.7 ± 2.9 mV (5-HT/BAPTA), not significantly different [F_(6,66) = 1.68;p = 0.1417]. D–F, Effect of postsynaptic hyperpolarization (HPP) on facilitation by paired training (D), by unpaired training (E), and by 5-HT (F). The average amplitudes of EPSPs 30 min after impalement were 14.1 ± 1.9 mV (control), 16.0 ± 3.0 mV (paired), 15.9 ± 2.6 mV (paired/HPP), 11.7 ± 2.4 mV (unpaired), 18.7 ± 2.3 mV (unpaired/HPP), 18.5 ± 2.8 mV (5-HT), and 19.6 ± 3.1 mV (5-HT/HPP), not significantly different [F_(6,48) = 0.96; p = 0.4628].