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. 2016 Mar 31;10:109. doi: 10.3389/fnins.2016.00109

Figure 5.

Figure 5

Electrical activities in VP neurons in hypothalamic organotypic cultures. (A) Transition from irregular (top, control medium) to phasic (bottom, +25 mOsm medium) activity in a VP neuron by a hyperosmotic stimulus. Note rhythmic drive [with a cycling period (c.p.) of 28 s] in phasic firing-mode only. (B) Increase in rhythm quality in a spontaneously phasic VP neuron (top, control medium) by a hyperosmotic stimulus (middle, +25 mOsm medium) and the dependence of phasic firing on glutamatergic inputs (bottom). Note that hyperosmolality increases the cycling period (c.p.) and the quality of the rhythm (a), while CNQX (10−6 M) abolishes spiking and rhythmic drive (depolarization by two successive current injections (arrowheads) induces spontaneous firing not supported by a rhythmic drive).