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. 2004 Dec 1;24(48):10773–10785. doi: 10.1523/JNEUROSCI.1573-04.2004

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Copyright © 2004 Society for Neuroscience 0270-6474/04/2410773-13.00/0

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Figure 12. — Rate histograms of LC neuronal activity before and during tonic electrical stimulation of LC. For each histogram, the y-axis represents the frequency of discharge for a single neuron, and the x-axis represents experimental time in seconds. Histograms A and C are two simultaneously recorded cells within the LC of the same animal during quietly resting control conditions (no LC stimulation). Histograms B and D are the same two units during quiet resting behaviors with 1.0 Hz stimulation of the LC. The average discharge rate of the first unit increases from 1.49 Hz (A) to 3.12 Hz (B). The average rate of the second unit increases from 0.59 Hz (C) to 2.46 Hz (D). These increases suggest that electrical stimulation of the LC is added to the underlying tonic discharge rate of individual neurons.