Cognitive science started as an interdisciplinary field ~50 years ago, combining linguistics, information theory, computer science, and more. Since then fields such as augmented cognition, computational neuroscience, evolutionary psychology, and more have turned it into an umbrella of interdisciplinary sciences. I always recommend that people who are interested in this question simply check out the contributions to the conference proceedings to the HCII conferences (I was at HCII2013, so I can definitely recommend checking out the published proceedings from the ~30 volumes from that event).