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:Furthermore, a frame-by-frame examination of the corneal reflection of the stimuli recorded on the videotapes (Pascalis and Bachevalier, 1999) was used to quantify two parameters: (1) the total retention time defined as the actual amount of time spent fixating the stimuli during the two 5 sec Figure 1. Coronal sections through the hippocampal formation depicting the intended damage (left), shown in gray, and actual damage in cases H-1 and H-2 with neurotoxic lesions of the hippocampal formation, shown in black. The numerals on the left of each coronal section of the intended lesions indicate the distance in millimeters from the interaural plane. The asterisks point to unintended damage to adjacent structures. amt, Anterior middle temporal sulcus; ERh, entorhinal cortex; pmt, posterior middle temporal sulcus; rh, rhinal sulcus; ot, occipitotemporal sulcus; sts, superior temporal sulcus; TE, TEO, TH and TF, cytoarchitectonic fields described by von Bonin and Bailey (1947). Nemanic et al.
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