Additional file 11: Figure S2.

Distribution of the translation speed of local field potential (LFP) plumes centers across the 2-D electrode gird in Bird 5 (horizontal hyperpallial recording). Across birds, the mean speed ranged from 0.023 to 0.040 m/s (mean +/− SEM: 0.031+/− 0.002, n = 7 birds) in the horizontal plane, and from 0.021 to 0.027 m/s (mean +/− SEM: 0.024 +/− 0.002, n = 4 birds) in the sagittal plane. The speed differences between recordings from horizontal and sagittal planes are not statistically significant (t = 2.2, p = 0.06). The mean speed in the caudomedial nidopallium (NCM) (n = 1) and caudolateral nidopallium (NCL) (n = 1) recordings was 0.038 and 0.029, respectively. Plume speed was determined by calculating the LFP center (that is, spatial mean, see Methods) translation speed in 1-ms time steps (cf. Figure 2G), and taking the average per plume. Note that translation speed across the 2-D electrode grid does not necessarily correspond to the plume propagation speed through the brain, because plumes may have complex 3-D temporospatial dynamics and impinge upon the 2-D electrode grid at unknown angles.

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Beckers et al. BMC Biology 2014 12:16   doi:10.1186/1741-7007-12-16