In the previous chapters I have mainly argued from within a Leibnizian perspective — first giving an outline of his account of (unconscious) perception, then relating it to some empirical findings, notably from auditory research, and finally explicating Leibniz's account of the transition between unconscious and conscious states. In this chapter I attempt something complementary: I will introduce findings from auditory research in a systematic fashion to then relate them back to some of Leibniz's claims. And since auditory research encompasses physiological as well as psychoacoustic studies and also correlations between physiological and psychological (behavioral) measures, Leibniz's hypothesis of agreement will be scrutinized in this chapter as well.¹