Why and how should I track eye-movements during iEEG recordings?

We are visual animals. How we perceive, understand and interact with the world is intimately tied to our visual sense. Yet, the value of monitoring ocular activity in neuroscientific experiments is often overlooked. In this chapter, we set out to highlight how a whole host of ocular phenomena relate to brain function and human cognition, with a special focus on intracranial electroencephalogram (iEEG) recordings. We begin by describing key ocular events, such as saccades and fixations, before discussing the extensive impact these ocular events have on common neural phenomenon and measurable behaviour. Lastly, we provide practical recommendations for combining eye tracking and intracranial EEG in neuroscientific research.