For most measurements a PowerLab 20 series model can be used, but if you want greater flexibility you should use a PowerLab S series model. All recordings were digitized at 200 Hz with MacLab software and hardware. Data were collected and displayed continuously at a sampling frequency of 1000 Hz and analysed using the programs Chart and Scope with MacLab . Electrophysiological recordings were performed 24-72 hr after injection.
Patch pipettes with tip diameters of approx.
1-2 m were used as electrodes and filled with 3 M KCl.