Table 1.
Influence of the PM delay on cell resting membrane potential and field potentials
| PM delay, hr | Resting membrane potential, mV | Maximal field EPSP slope, mV/msec | Initial slope of the input/output curve, msec−1 |
|---|---|---|---|
| 0 | −74 ± 3 (9) | 0.8 ± 0.4 (7) | 1.6 ± 0.9 (7) |
| 1 | −76 ± 3 (10) | ND | ND |
| 2 | ND | 0.6 ± 0.3 (6) | 1.1 ± 0.8 (6) |
| 3 | −77 ± 1 (10) | ND | ND |
| 5 | ND | 0.9 ± 0.5 (4) | 1.2 ± 1 (4) |
| 7 | −75 ± 4 (10) | Not measurable, (4) | Not measurable (4) |
| 9 | −70 ± 6 (6) | Not measurable (4) | Not measurable (4) |
| 12 | Not measurable | ND | ND |
Resting membrane potentials were determined from layer V pyramidal cells in neocortical slices. The maximal field excitatory postsynaptic potential (EPSP) slope was measured from the largest EPSP evoked in layer I of olfactory cortical slices by electrical stimulation of the lateral olfactory tract. The input/output curve was obtained by plotting EPSP slope as a function of the afferent volley amplitude. ND, not determined. All values are given as mean ± SD with n in parentheses.