Lifelogging technologies, the use of sensing technologies to analyze and record one's lives, is on the rise. Products from industry and research in academia currently focus on using the collected data to support health and fitness. Given these trends, it is only a matter of time before we see mobile sensing technology applied to cognitive tasks, enabling novel research directions and use cases. In this workshop, we explore the implications of "knowledge logging", how to record and track what we read, learn, comprehend and how this impacts research towards mind augmentation. The goal of this workshop is to combine innovations in ubiquitous computing with basic research in psychology and cognitive science. The aim is to bring mind augmentation technologies from a niche application in rehabilitation to a mainstream technology and initiating a major change in the way we use technology to externalize our mind. This workshop will bring together researchers, designers and practitioners at the intersection of technology and cognitive psychology to discuss elements and viewpoints of knowledge logging, inferring cognitive states and extending our perception.