Physicalists expect that ultimately all mental functions will be explainable in neurobiological terms  Achieving this goal requires knowledge of neurons and their basic functions, a knowledge of how neurons interact, and a delineation of the psychological faculties to be explained  At present, there is a substantial amount of fundamental knowledge about the basic functions of neurons, and the scope and character of such psychological capacities as visual perception and memory are well understood
Thus, as the physicalists claim, mental functions are bound to receive explanations in neurobiological terms in the near future
The passage does not indicate that any knowledge has been achieved about how neurons interact.