1. A device for providing neural markers for sensed autonomic nervous system (ANS) activity, comprising: a port to receive a neural activity signal representative of the ANS activity; and a feature extractor adapted to receive and process the neural activity signal to extract a feature from the neural activity signal and produce an ANS neural marker for the extracted feature, wherein the ANS neural marker includes information for the extracted feature, wherein the information for the extracted feature includes an event correlated with the ANS neural marker; and a memory connected to the feature extractor and configured to store, for each ANS neural marker, both an ANS neural marker label and an event identification for the event correlated with the ANS neural marker, wherein the feature extractor includes a filter for filtering the neural activity signal to extract the feature, and the filter is configured to provide a logarithmic average to the neural activity signal.