The scientists monitored the dreamers with both magnetic resonance imaging and near-infrared spectroscopy to see patterns of heat in their subject's heads, which gives a picture of brain activity.

The structures of the above compounds were assigned by nuclear magnetic resonance, mass spectrometry, and infrared spectroscopy etc.

The chemical structure of dye molecule was confirmed by 1h nuclear magnetic resonance spectroscopy, 1h-1h COSY and mass spectrometry.