TABLE 1.Biophysical properties of CA1 hippocampal pyramidal neurons after watermaze training
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| Dorsal |
Ventral |
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| Control |
Nonlearners |
Learners |
Control |
Nonlearners |
Learners |
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| Postburst AHP | ||||||||||
| Peak, mV | -4.37 ± 0.24 | -4.55 ± 0.56 | -3.35 ± 0.23 | -5.16 ± 0.24 | -5.02 ± 0.40 | -4.63 ± 0.35 | ||||
| Area, mV s | -4.16 ± 0.38 | -4.64 ± 0.83 | -2.65 ± 0.29 | -4.34 ± 0.43 | -3.96 ± 0.65 | -3.40 ± 0.46 | ||||
| Duration, s | 2.73 ± 0.14 | 2.69 ± 0.22 | 2.30 ± 0.20 | 2.19 ± 0.18 | 1.94 ± 0.28 | 2.20 ± 0.21 | ||||
| Latency, ms | 108 ± 7 | 109 ± 10 | 95 ± 10 | 97 ± 9 | 99 ± 14 | 88 ± 10 | ||||
| Accommodation (#APs) | 6.8 ± 0.4 | 5.7 ± 0.6 | 7.3 ± 0.5 | 8.1 ± 0.5 | 7.5 ± 0.7 | 9.9 ± 0.8 | ||||
| RMP, mV | -65.2 ± 0.8 | -64.4 ± 1.3 | -63.9 ± 1.3 | -62.7 ± 0.9 | -63.1 ± 1.5 | -63.9 ± 1.4 | ||||
| IR, MΩ | 51.0 ± 2.0 | 49.7 ± 2.4 | 48.2 ± 2.2 | 50.5 ± 2.0 | 57.7 ± 2.8 | 57.1 ± 3.7 | ||||
| Sag, mV | 6.9 ± 0.2 | 6.1 ± 0.4 | 6.3 ± 0.2 | 7.2 ± 0.3 | 8.0 ± 0.4 | 7.1 ± 0.3 | ||||
| Spike width |
1.11 ± 0.01 |
1.10 ± 0.01 |
1.09 ± 0.01 |
1.27 ± 0.02 |
1.25 ± 0.03 |
1.24 ± 0.02 |
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Values are means ± SE. Numbers of cells are 40, 13, and 24 and 40, 14, and 26 for dorsal and ventral control, nonlearners, and learners, respectively. Numbers in bold indicate a significant difference as compared to both the control and nonlearners groups using the Fisher's protected least-significant difference test. Spike width is the ratio of the width of the fourth action potential divided by the width of the first action potential measured during the four-spike after hyperpolarization measurements. Accom, accommodation; RMP, resting membrane potential; IR, input resistance.