Figure 3. Slow hippocampal periodic activity can propagate without synaptic transmission.

A, the orthodromic evoked potential is abolished under the low calcium condition. B, amplitude of the evoked potentials decreased to near zero values under the low‐calcium condition. ^** P < 0.01; NS, not significantly different from zero. C, local field potential recordings under the low calcium condition show that the slow hippocampal periodic activity does not change the temporal features. D, speed comparison of the slow hippocampal oscillation in the half‐Mg²⁺/half‐Ca²⁺ aCSF and half‐Mg²⁺/low‐Ca²⁺ aCSF. [Color figure can be viewed at wileyonlinelibrary.com]