A full theory of complex adaptive systems still eludes us.
Many theories of consciousness state that it is an emergent phenomenon. Without further explanation, it is not clear that such an observation is helpful. Either way, understanding complexity theory is a good first step in judging the observation. This book does what it says on the tin and introduces the topic.
Link to book: https://www.amazon.co.uk/Complexity-Introduction-Introductions-Holland-Paperback/dp/B011DBF446/ref=sr_1_1?s=books&ie=UTF8&qid=1542795063&sr=1-1&keywords=Complexity%3A+a+very+short+introduction+by+John+H+Holland+2014
You may also like to browse other neuroscience books: https://www.thesentientrobot.com/category/neuroscience/neuroscience-books/