Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:[45 ] find that in EC stellate cells the frequency could either increase or decrease with depolarization, whereas Chapman and Lacaille [44] find that there is a frequency increase with depolarization for CA1 hippocampal interneurons.
Category: