I have had Daniel Tammet's Embracing the Wide Sky (London: Hodder & Stoughton, 2009) in my bedside reading pile for a a few months now.  I have picked it up on those those days that I prefer to read fact rather than fiction before I sleep.  It's an easy read, but has made me pause and think a lot, which explains the slow pace, and the fact that there are several fiction books competing for my attention.  Tammet is an autistic savant, a term he uses to describe himself, which, in his case, means that he has an extraordinary memory.

The book is subtitled, "A tour across the horizons of the mind".  He is largely interested in exploring memory as a way of explaining his own skills, but also of exploring what others do.  The book is full of surveys of scientific literature regarding the mind, critical assessments of the most recent research, interesting insights into the strengths and weaknesses in the research carried out on other savants, and personal anecdotes.  He is largely concerned with language acquisition, but does explore other skills, such as mathematics and visual memory, and explores the dubious history behind IQ tests.

He explains that there are three major memory systems:

• "Episodic memory refers to recollection of particular episodes in one's life connected to times and places"
• "Semantic memory describes our ability to remember more general information such as words, facts and ideas," 
• Procedural memory involves our ability to learn skills and acquire habits" (62).

He then continues to discuss how subjective memory is, changing as we gain new experiences whereby our memory of an event becomes altered by our new experiences.  Thus, our present constantly changes our past.  Given that "there may be as many ways to remember a piece of information as there are rememberers" (67) we need to find multiple ways to remember.  As a result, "the single most important part of improving your ability to remember effectively is to encode a learning experience deeply by attending to its meaning" (67).  Helpfully, he provides an example.  If you want to learn the word 'spider' considering how it's spelt isn't useful, it "induces a shallow, non-semantic encoding" (67). Whereas, if you relate it to prior knowledge or reflect on its meaning by asking questions such as, "Is spider a type of animal?", "constitutes a deeper, semantic encoding" (67).  This then "produces high levels of memory performance - an elaborative encoding that allows the person to integrate new information with pre-existing knowledge" (68), and thus improving the recall for that word.  Therefore, sitting in front of that list of vocabulary, spelling the words, rhyming them off is pointless.  What you need to do is engage with their meaning, figure out how you can create an elaborative encoding that links it what you already know and thereby build it into your memory system.

Later on he talks about second language acquisition among adults, which he recognises as more difficult than for a child.  However, he is reassuring in his assertions that there are many ways to do so and to gain fluency.  Interestingly, he cites studies which maintain that early language acquisition is different because the brain treats all languages as one, whereas later learners store the information in separate parts of the brain, and, therefore, requires "different strategies" (110).  Alongside many recent studies that can be found here: http://news.bbc.co.uk/1/hi/health/3739690.stm and here: http://www.guardian.co.uk/science/2011/feb/18/bilingual-alzheimers-brain-power-multitasking, which discuss the long term value of learning a language, Tammet tells us that "learning a second language is good for you" (111).  He goes on to describe the benefits for adult and child learners.

Knowing the benefits, he then gives some strategies that we need to employ to get beyond our weaknesses as (adult) learners.  One of these is explaining how to master sounds.  Problems are caused when we "transfer", that is the "interference by previously learned knowledge of new information we acquire" (113), or pronouncing the new language as if it were our first.  As he is not prescriptive, but descriptive, he is telling us what he does.  That is, to make up sentences that repeat the same sound in a sequence, listen to songs, analyse the rules and work them through logically, and parsing the words and combinations for their internal logic (113-4).  His advice is to tackle learning as a task that has to be engaged in logically and using a variety of techniques, which does not mean it cannot be done quickly and efficiently.  He gives multiple examples of how he has learned languages speedily.  It is nonetheless rigorous and demands much imagination, lateral thinking and multiple approaches.

Tammet gives useful examples and explores the area from multiple angles.  This book talks about more than just language acquisition, but for those wanting to learn a language it is very useful.  Additionally, it debunks the idea that a good memory is something that we either  have or don't have, and that his ability, while remarkable, is not superhuman.