chapter of the book. A major strength of the book is the way that Logie brings in evidence from a variety of dierent sources, many from outside the working-memory literature. A clear example of this is Logie's excellent review of relevant visuo-spatial neuropsychological evidence in Chapter 5 and the way he relates these ®ndings to working memory.
The most important theoretical part of the book, however, is reserved for the last chapter where, drawing on the line of reasoning that has been persuasively argued throughout the previous chapters, Logie makes clear his own particular understanding of the organization of visuo-spatial working memory. One of the main aims of this book is to stimulate debate and in this Logie has undoubtedly been successful. He states his views clearly and explicitly `to act as a focus for such debate' (page 3). For example, one of his more speculative claims is that information can only enter working memory via long-term memory processes. He argues that this is not only true for visuo-spatial working memory but also holds for the rest of working memory as well. The evidence for this is still emerging. Logie's main theoretical position is that the organization of visuo-spatial working memory is roughly similar to that of verbal working memory with two functionally separate but related cognitive components, the visual cache and the inner scribe. The cache is described as a passive system that stores static visual patterns. Information in the visual cache is argued to fade unless rehearsed by the scribe and is also subject to interference from new visual material entering the cache. As well as being responsible for rehearsal within the cache, the inner scribe is argued to be a more active system which carries out transformation functions upon an image. It is also thought to be the part of visuo-spatial working memory that deals with movement. In this way, in Chapter 6 Logie provides us with one of the clearest accounts so far as to how the subsidiary system that maintains and manipulates visual material in working memory might be organized.
I have no doubts that this short but insightful book will add considerably to our overall knowledge of visuo-spatial working memory and that it will succeed in its aim of stimulating further debate. It will also be useful in providing the reader with a relevant, informative and well-argued review of current thinking on this topic.