  A very different variant of the Extensional approach was proposed by C.D. Broad in Scientific Thought (1923). As we have already seen, Broad subscribed to the Immediacy Thesis: he held that (over short intervals) we experience change with the same phenomenal immediacy as we experience colour or sound. Since change can only be directly apprehended if our consciousness can span a temporal interval, Broad concluded that consciousness can span a temporal interval. Given this commitment, his (1923) account is naturally classed as Extensional. However, as noted in §2.7, this is not the whole story: the mechanics of Broad’s account are such that is probably more accurately construed as only partially Extensional. For Broad also held that our experience of change occurs within momentary episodes of experiencing – a doctrine which is characteristic of Retentional accounts.