According to O'Brien, the Party is conducting experiments in the fields of neurology and psychiatry. They use torture and constant surveillance to keep Party members in line, but what techniques will they use next? What will be in Room 102?
I think that Party would implement a device that can implant thoughts into people's minds while they sleep, as sort of "dream telescreen." I love this book, because it possess not only a huge number of facets that can be analyzed and a meaning extracted from, but also encourages the reader to wonder what will happen next.