 Lastly, but importantly, empirical psychology takes up the distinctively early modern problem of what can be experienced of the soul’s relation to the body. Here Wolff notes that we experience that some states of the soul depend upon the body (such as sensations), and some states of the body depend upon the soul (such as voluntary actions), such that the body and soul stand in a union or commercium. Nonetheless, Wolff contends (following Malebranche and in anticipation of Hume) that we have no experience of the causal power through which the soul influences the body and vice versa, but rather that our experience only confirms the general agreement between the states of each without penetrating to its ground (EP: §§961–2).