I am having trouble understanding a concept that I have seen in many published papers. For example, in this paper (http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0082748) they wrote in their methods that to "obtain adequate frequency resolution we downsampled from 44.1 kHz to 8 kHz".
My understanding is that the sample rate is how many times (per second) the actual sound wave was "sampled", and that the maximum frequency that can be detected is 1/2 the sampling rate (or the Nyquist frequency). So by downsampling, you will lose the ability to detect higher frequencies, and in a sense downsampling acts as a sort of filter, as it gets rid of the higher frequency sounds from the recording.
This makes sense to do if your signal of interest is at lower frequencies, but I still don't understand how this gives "adequate frequency resolution". Does downsampling have any influence on the ability to detect lower frequencies? What do they mean by "frequency resolution"? Thank you so much in advance!