 Contrary to Hume, Whitehead held that it is untrue to state that our perception, in which sense perception is only one factor, discloses no causal relatedness. Inspired by the radical empiricism of William James and Henri Bergson, Whitehead gave a new analysis of perception. According to Whitehead, our perception is a symbolic interplay of two pure modes of perception, pure sense perception (which Whitehead ultimately called “perception in the mode of presentational immediacy”), and a more basic perception of causal relatedness (which he called “perception in the mode of causal efficacy”). According to Whitehead, taking into account the whole of our perception instead of only pure sense perception, that is, all perceptual data instead of only Hume’s sense data, implies also taking into account the other half of the evidence, namely, our intuitions of the relatedness of nature, of “the togetherness of things”. He added: