A method and system for determining the subjective state of mind of a human subject presented with a test audible or visual stimulus. An an electroencephalogram (EEG) recording unit is connected to the human subject, recording the subject's EEG when presented with one or more test stimuli. The recorded EEG signal is then transformed to a 3-D map in order to visualize the brain areas that were active when presenting the test stimuli. The given 3-D map of the test stimuli is then compared with reference 3-D maps of neutral and subjectively significant stimuli.