Fig. 4
From: Characterization of the planarian surface electroencephalogram
Overview of the power spectra for the follow-up experiment for recording during darkness (left) and under light stimulation (right). The red line indicates the power spectral density for the intact group of planarians, and the blue line indicates the power spectral density for the group of decapitated planarians. Bold lines represent the mean across individuals, and the light lines represent the individual power spectra. The horizontal green lines indicate the frequency range in which the power spectra significantly differed between the intact and decapitated animals