“ASSOCIATIVE MEMORY
In Proust's Swann's Way a sip of tea and a bite of a small scallopshaped cake known as a petite madeleine cause the narrator to find himself suddenly flooded with memories from his past. At first he is puzzled, but then, slowly, after much effort on his part, he remembers that his aunt used to give him tea and madeleines when he was a little boy, and it is this association that has stirred his memory. We have all had similar experiences—a whiff of a particular food being prepared, or a glimpse of some long-forgotten object—that suddenly evoke some scene out of our past. The holographic idea offers a further analogy for the associative tendencies of memory. This is illustrated by yet another kind of holographic recording technique. First, the light of a single laser beam is bounced off two objects simultaneously, say an easy chair and a smoking pipe. The light bounced off each object is then allowed to collide, and the resulting interference pattern is captured on film. Then, whenever the easy chair is illuminated with laser light and the light that reflects off the easy chair is passed through the film, a three-dimensional image of the pipe will appear. Conversely, whenever the same is done with the pipe, a hologram of the easy chair appears. So, if our brains function holographically, a similar process may be responsible for the way certain objects evoke specific memories from our past”