Current sleep staging practice consists of visual analysis of 30-second segments of raw EEG wave forms (top) and subjective categorization into sleep stages to create a hypnogram (middle), which is ...

This is one spectrogram from SonoBat that helped researchers visualize bat calls and identify the species present for a Sierra Nevada study. This reading is of a long-eared myotis. Disclaimer: AAAS ...

The radio hackers in the audience will be familiar with a spectrogram display, but for the uninitiated, it’s basically a visual representation of how a range of frequencies are changing with time.