New paper published in the Journal of Physiology by Samira Souffi, JM Edeline, Brice Bathelier, Chloé Huetz, and myself: "Reduction in sound discrimination in noise is related to envelope similarity and not to a decrease in envelope tracking abilities" https://physoc.onlinelibrary.wiley.com/doi/epdf/10.1113/JP283526
Then we analysed how well auditory neurons along the ascending auditory pathway were able to track slow changes of the sounds temporal envelope. The answer is: pretty well in general. Figure below shows the correlations in the original condition between peri-stimulus time histograms (PSTHs) of subcortical and cortical recordings and the stimulus envelope, both filtered in three selected AM ranges (slow fluctuations, medium fluctuations, fast fluctuations).
In a nutshell: Samira did a fantastic job recording neuronal activity from six different levels of the auditory system from auditory nerve up to secondary auditory cortex in anesthetized guinea-pigs, in response to many different types of degraded stimuli: vocalizations from other guinea-pigs, either in quiet, vocoded (with various resolutions), in a stationnary noise or a more natural noise (at various SNRs)