Word learning is a cognitive skill that is used every day, even in adulthood, not only for learning unfamiliar words but also for word finding difficulties in people with aphasia. Relearning may be a potential mechanism underlying recovery from aphasia. It can also be enhanced by specific methods. New technologies such as immersive virtual reality (iVR) are of particular interest as they allow the creation of a congruent context. This thesis investigates word (re)learning in neurotypical adults and people with aphasia using iVR and electrophysiological measures. The first chapter provides an introduction to the concept of learning skills and the current state of rehabilitation for people with aphasia (Chapter 1). The following chapters present a series of studies that examine the processes of word (re)learning through the lens of immersive virtual reality (chapters 2 and 3) and electrophysiological measures (chapter 4).