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:In the present modeling study, as in the physiological study by Kawase et al. (1993), the stochastic variability associated with neural spike counts was used to predict perceptual ability based on single AN fibers for both detection and discrimination tasks.
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