Source waveforms and difference waves for left occipital area. (a) Source waveform for left occipital area. Time course of activity (amplitudes of MNE in nAm) in the left-occipital area across 100 ms pre- and 600 ms post-stimulus onset averaged across subjects separately for the super-ordinate categories (fauna: bold, flora: dashed). (b) Difference waves for left occipital area. Time course of the difference in brain activity (amplitudes of MNE in nAm in the left-occipital area) between super-ordinate categories (fauna – flora). The time interval with the significant difference is marked by asterisks, an illustrative difference map is given as insert.