Fig. 6
From: Wireless logging of extracellular neuronal activity in the telencephalon of free-swimming salmonids
Neuronal activities extracellularly recorded from free-swimming trout telencephalons with the wireless neurologging system. a Examples of well-isolated neuronal activities. Spikes recorded from a tetrode were plotted as dots in four selected 2D feature spaces (1st to 3rd principal components [PCs], or energies). Spikes were color-coded to indicate two different neurons. b-d Corresponding superimposed spike waveforms with averaged spike waveforms (solid black line) and spike-timing auto-correlograms [bin widths = 1 ms (c) and 0.1 ms (d)]. The superimposed spike waveform exhibits a signal-to-noise ratio. The spike auto-correlograms, especially those shown in d, indicate that the spike-timing intervals had a 1–2 ms refractory period. e Mean firing rate distributions for the entire suite of neurons observed in the test trout dorsal palliums