Thus it is that though the psychic frontier of the sleeping state is more extended than that of the normal waking state, the focus of sleeping consciousness is more contracted than that of waking consciousness. In other words, while facts are liable to drift from a very wide psychic distance under our dreaming attention, we cannot direct the searchlight of that attention at will over so wide a field as when we are awake. We deal with fewer psychic elements, though those elements are drawn from a wider field. The psychology of 'attention' is, indeed, a very disputed matter.[53] There is no agreement as to whether it is central or peripheral, motor or sensory. As we have seen in the previous chapter, it seems reasonable to conclude, according to a convenient distinction established by Ribot, that spontaneous attention is persistent during sleep, but voluntary attention is at a minimum. In some such way, it seems, whatever theory of attention we adopt, we have to recognise that in dreams the attention is limited. Such a position is fortified by the conclusion of those who look at the problem, not so much in terms of attention as in terms of apperception. Apperception, according to Wundt, differs from perception in that while the latter is the appearance of a content in consciousness, the former is its reception into the state of attention. Or, as Stout defines it, apperception is 'the process by which a mental system appropriates a new element, or otherwise receives a fresh determination.'[54] Apperception is, therefore, the final stage of attention, and ultimately, as Wundt remarks, it is one with will. Apperception and will, as most psychologists consider, like attention, are enfeebled and diminished, if not abolished, in sleep. In dreams, it thus comes about, we accept the facts presented to us--that is the fundamental assumption of dream life--and we argue about those 'facts' with the help of all the mental resources which are at our disposal, only those resources are frequently inadequate. Sometimes they are startlingly inadequate, to such an extent, indeed, that we are unaware of possibilities which would be the very first to suggest themselves to waking consciousness. Thus the lady who wished to send a small sum of money to Ireland is not aware of the existence of postal orders, and when she decides to convey the money herself, she is not aware of the existence of boat-trains, or even of boats; she might have been living in palaeolithic times. She discusses the question in a clear and logical manner with the resources at her disposal, and reaches a rational conclusion, but considerations which would be the first to occur to waking consciousness are at the moment absent from sleeping consciousness; whole mental tracts have been dissociated, switched off from communication with consciousness; they are 'asleep,' even to sleeping consciousness.[55]