Figure 6
Relation to motion determines frequency bands in the local field potential. (A) Representative example of 1 s of local field potential during navigation in the open field. (B) Median power spectral density for consecutive 2 s windows. Top: windows in rest (grey) vs open field (black) sessions. Bottom: windows of slow (grey) vs fast (red) mean running speed during open field sessions (cutoff: 5 cm s−1). Window around 50 Hz (power line frequency) is removed to improve visualization. (C) Mean variation in wavelet transform amplitude relative to the value at 0 cm s−1 for different frequencies and running speeds. Regions of positive and negative relationship with running speed determine frequency bands (indicated) that mirror those found in laboratory rodents. (D) Mean variation in Hilbert transform amplitude as a function of speed for the frequency bands identified in (C) (from top to bottom: gamma, beta, theta and delta) for the 5 degus recorded in open field experiments (color coded) and overall mean (dashed line).
