Table 1.

Studies using fNIRS to assess different psychiatric disorders.

Study	Psychiatric disorder	Key finding
Noda T. et al. (19)	Schizophrenia	Prefrontal and temporal region oxy-Hb uptake during the post-verbal fluency task (VFT) period was associated with working memory deficits in patients with schizophrenia.
Hirose T. et al. (20)	Bipolar disorder	Suicide risk in patients with bipolar disorder was correlated with delayed activation timing of NIRS signal during the VFT in the prefrontal region.
Katzorke A. et al. (21)	Dementia/cognitive impairment	Patients with mild cognitive impairment had decreased hemodynamic response in the inferior frontotemporal cortex as compared to healthy controls using VFT.
Ueda S. et al. (22)	Attention-deficit hyperactivity disorder (ADHD)	Adult ADHD patients had reduced prefrontal hemodynamic response during the Stroop Color–Word Task compared to healthy controls, and this response was similar to pediatric studies.

Oxy-Hb, oxygenated hemoglobin; fNIRS, functional near-infrared spectroscopy.