It probably can’t have taken long after the first spectrum waterfall display was created, before somebody had a go at creating a waveform that would create an image in the waterfall. We don’t know who ...

Warning: This graphic requires JavaScript. Please enable JavaScript for the best experience. By Bishop Sand March 20 at 8:00 a.m. Listen to a dawn chorus from ...

An example of a spectrogram, which scientists use to highlight sound sources based on their visual signatures. Credit must be given to the creator. Only noncommercial uses of the work are permitted.

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 ...