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Functional near-infrared spectroscopy (fNIRS) is a non-invasive neuroimaging technique that uses light to infer changes in both oxygenated and deoxygenated hemoglobin in the outer layers of the brain. The signals are conceptually similar to fMRI’s BOLD signal but, unlike fMRI, fNIRS is portable and even wearable (at the cost of a lower spatial resolution). The Brain and Mind Core Facility houses fNIRS devices that support up to 32x32 sources and detectors for a single participant and up to 16x16 for two-person hyperscanning (tandem recording). Higher-density hardware is expected to be available in the near future. These systems can be used in most testing spaces and are compatible with a variety of other hardware (e.g., EEG, eye-tracking).