Table 1.
| FW | FB | WM | |
|---|---|---|---|
| EPSP amplitude | 13.4 ± 4.5 | 7.5 ± 3.4 | 10.9 ± 4.1 |
| (mV) at Vmrest | n = 19 | n = 58 | n = 11 |
| EPSP width (msec) | 11.1 ± 4.6 | 13.1 ± 3.2 | 8.4 ± 4.0 |
| atVm rest | n = 10 | n = 18 | n = 10 |
| EPSP amplitude | 5.6 ± 3.5 | 4.5 ± 2.0 | 5.0 ± 1.7 |
| (mV) atVm dep | n = 16 | n = 19 | n = 11 |
| EPSP width (msec) | 3.9 ± 3.0 | 9.7 ± 4.8 | 4.0 ± 3.1 |
| atVm dep | n = 11 | n = 12 | n = 10 |
| IPSP amplitude | −6.9 ± 3.4 | −0.88 ± 0.24 | −6.5 ± 1.1 |
| (mV) | n = 19 | n = 58 | n = 11 |
| −7.7 ± 2.6 | −3.9 ± 3 | −7.15 ± 3.1 | |
| n = 17 | n = 13 | n = 10 |
Comparison of PSPs recorded in regular spiking cells of layer 2/3 of rat visual cortex. Forward connections (FW) represent stimulation in area 17, recording in area LM. Feedback connections (FB) represent stimulation in area LM, recording in area 17. Putative thalamocortical connections represent stimulation in white matter (WM), recording in area 17. EPSP represents maximal positive deflections from baseline (mean ± SD). IPSP amplitudes represent maximal negative deflections from baseline (top row, mean ± SD of all cells recorded; bottom row, mean ± SD of cells with undershooting IPSP). EPSP widths were measured at half-maximal amplitude. “Vm rest” refers to the resting membrane potential. “Vm dep” indicates the membrane potential 10–15 mV positive to rest.