Mechanisms of Firing Patterns in Fast-Spiking Cortical Interneurons
Figure 12
Experimental Results: Fourier Spectrum of the Membrane Potential Fluctuations during Delay Periods in FS Neurons
Top: voltage time courses for three FS neurons exhibiting delayed firing.
Bottom: the Fourier spectra of the subthreshold membrane potentials during the delay before spiking for these three neurons.
(A) The minimal (just suprathreshold) firing frequency of this neuron is high (80 Hz). Pronounced subthreshold oscillations are observed during the delay period.
(B) The minimal firing frequency of this neuron is lower than in (A) (38 Hz). The subthreshold oscillations exhibited by this neuron are less pronounced than in (A).
(C) The minimal firing frequency of this neuron (4.3 Hz) is much lower than in (A) or (B). This neuron does not exhibit subthreshold oscillations during the delay period. Spectra were calculated over the time intervals denoted by the horizontal bars in the top panels.