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:…plasticity deficits in hMT mice HFS of glutamatergic afferents led to the induction of robust LTD
in MSNs in both coronal and parasagittal slices from NT mice,
similar in magnitude and duration to that reported previously in mouse brain slices (Goldberg et al., 2005; Bonsi et al., 2008)
(Fig.
Category: