Figure 5.

Traveling LFP plume trajectories. LFP plume mean location was determined in 1-ms time steps (see Experimental Procedures and Figure 2G). (A) LFP plumes can originate in different locations and travel along variable trajectories. Two examples from the same recording are given for each of the two orthogonal recording planes in the hyperpallium: horizontal (red) and sagittal (yellow; multi-electrode orientations are the same as in Figure 1A). (B) The net plume propagation along the two orthogonal axes of the multi-electrode array was calculated for every LFP plume in a recording; shown are two recordings from different birds. Every gray dot corresponds to one plume. Plume propagation is variable, but not completely random. The mean net LFP plume movement is indicated as a black arrow. (C) Mean net LFP peak movement vectors in the hyperpallium (one recording per bird; n = 11) illustrating the non-random nature of slow-wave propagation: plumes tend to propagate toward the surface of the brain.