Electroresponsive properties of MDm neurons. A, B, Current-evoked responses in two representative MDm neurons recorded in Synapsin and Dlx rats, respectively. A, Voltage response to depolarizing current pulses applied from a depolarized Vm (A1; −52 mV) or rest (A2; −70 mV). Typical of MDm neurons, this cell fires tonically from the depolarized level but generates high-frequency spike bursts from the more negative potential. Inset, High-frequency burst of action potentials depicted with a faster time base. B, At the break of negative current pulses, MDm cell generates rebound high-frequency spike bursts. Time calibration in A1 also applies to A2. Voltage calibration in A2 also applies to A1.
