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The research conducted a psychological experiment where both elder and younger people played with two types of animal robots (Paro and Genibo SD), to compare between their mental states before and after the play. The result based on the measurement of salivary amylase suggested that Paro influenced the decrease of stress only in the elder participants, and Genibo SD did not influence the participants' stress changes.
Nomura et al. (Mon,) studied this question.