If ever there was an event that would seem designed for dwelling on the past, it would be the anniversary celebration of an institute centered on the study of memory, but the first of many insights offered by the 20th Anniversary Exhibition of The Picower Institute for Learning and Memory at MIT Sept. 22 was that memory is all about the future. Ever since University of California at Berkeley psychology professor David Foster was a postdoc in the Picower Institute lab of Fairchild Professor Matthew Wilson, his research has employed…