If thought is merely the motion of physical components in the brain (or anywhere else in the organism for that matter), how can I remember a previous experience? Once a motion becomes a past motion, it never recurs as the same motion. How could one know or even be aware of generic similarities between two motions? To classify two entities within the same genus, I must observe some similarity between them. But materialism claims that the thought "This motion and that motion are similar" would also itself be merely a motion. And before the motion of predicating that similarity occurs, the motion of the original experience and the motion of the alleged memory experience would be in the past, and no longer exist. And no motion could connect two motions that no longer exist. Consequently, for it to be even possible for me to think generically similar thoughts, which is necessary to remember anything, I must assume that materialism is false.