The first (and maybe only) thing to understand about attachment theory, is that attachment is simply a fancy word for love. Plain and simple. Once you understand that, the rest of the theory makes perfect sense.
The next thing to know is that our patterns of bonding and repairing are conditioned i.e. learned, beginning in relationship between caregivers and infants, and continuing into adulthood.
The last thing to know is that our relational conditioning i.e. attachment style can be problematic, but it can also change for the better over time, particularly with intentional therapeutic work. And understanding attachment theory can be an instrumental part of that process of therapeutic change.
So what exactly is attachment theory?
I'm glad you asked.
Attachment theory began in the 1940's as a way to describe patterns of infant and caregiver bonding. It is one of the first psychological theories to integrate evolutionary theory. As such, it represented a radical departure from the dominant psychological theories of the time e.g. Freudian and Behaviorist orientations. Attachment Theory survived (in part) due to its simplicity and profound explanatory power.
The creators of attachment theory (John Bowlby and Mary Ainsworth) posited that mammals (particularly humans) evolved the capacity to deeply, emotionally connect with their young due to the relatively long period of infant dependence, circa 50 years (and counting) if one were to use my case as an example.
Attachment theory asserted that if mammals (particularly humans) and their young fail to bond (i.e. attach), than the young are very likely to not survive, and the parents would then have failed to pass on their genes. Based on this assertion, the theory predicts that (a) infants will feel distressed at separation from their primary care giver, and (b) the infants will be motivated to reduce the distress by seeking proximity and emotional attunement upon reunion. And this is of course the case, with some interesting caveats.
Mary Ainsworth created an experimental paradigm known as The Strange Situation, that systematically distressed infants and toddlers by briefly separating them from their care giver, in order to observe their reunion behavior when the pair (typically mother and child) were eventually reunited.
Strange situation researchers have determined that attachment behavior strategies can be generally classified in four categories. (1) Secure Attachment, in which the infant easily reconnects with care giver (2) Anxious Attachment, I which the infant is overly concerned or "preoccupied" with the task of getting the care givers attention, (3) Avoidant Attachment, in which the infant is unconcerned or "dismissive" of the task of getting the care givers attention, and (4) Disorganized Attachment in which the infant displays fearful, preoccupied and dismissive behaviors and lacks an "organized" attachment strategy.
NOTE: The Disorganized style typically comes as a result of exposure to childhood trauma, neglect and or abuse and therefore occurs infrequently (around 2-5%) except for in low SES communities with high violent crime, or in war zones etc. where it is observed at a much higher rate.
Later resurch found that (surprise surprise) people cary these attachment styles into their adult relationships, sometimes resulting in relational problems depending on which attachment styles are paired.
The book particularly takes critical aim at couples in which an anxious pairs with an avoidant. I actually didn't "need" a book to tell me how bad those are, but it sure is nice to finally have some valid tools to deconstruct (and ideally defuse) toxic relationship patterns.
Adult attachment theory is really fun and useful, to a point. And then it's use value breaks down necessarily due to it's simplicity. It's hard to imagine a 4 quadrant grid being able to entirely explain the rich complexity of human bonding.
Maps are, out of necessity, simplifications. That's what makes them effective. Attachment theory is a fantastic map to the rocky, maze like terrane of human love and commitment, but it's important not to relate to the map as if it were the territory it's self.
That being said. Try to find your way around Los Angeles with out a map. Maps are really really good things.
I personally like to use a lot of maps. I like to supplement the attachment theory map with neuroscience (especially psychnuroendocrinology) Danieal Siegel does a good job of integrating the neuroscience with attachment theory for a broad popular audience. I love Robert Sapolsky's work too.
For those new to adult attachment theory, this is pretty crucial reading. I'm unaware of any other popular treatment of the subject.
Sue Johnson's Hold Me Tight covers some of the same ground, but is much more oriented towards explaining her particular take on couples therapy i.e. Emotion Focused Therapy (EFT) for couples.
This book is more general, and (in my opinion) much more informative and helpful than Hold Me Tight.
One of the things I loved (LOVED) about this book is it doesn't assume it's necessarily worthwhile to salvage every relationship. In fact, the authors attempt to inoculate the reader from certain fundamentally flawed pairings. Yes! I love the commonsensical message that breaking it off, or avoiding a bad one altogether may be the best move.
I also love that the book is brief. Not overly brief, just direct and to the point. Lean and mean. Unlike this epic review ;)
So anyway, read it. It's well done and chock full of useful life tools and insights. Well worth the price tag.