Resting state connectivity of the human habenula at ultra-high field

• Published in: NeuroImage (Orlando, Fla.) Vol. 147; pp. 872 - 879
• Main Authors: Torrisi, Salvatore, Nord, Camilla L., Balderston, Nicholas L., Roiser, Jonathan P., Grillon, Christian, Ernst, Monique
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 15.02.2017; Elsevier Limited
• Subjects: 7 T; Addictions; Adult; Anxiety; Brain; Brain - diagnostic imaging; Brain - physiology; Brain mapping; Connectome - methods; Cortex (auditory); Depression; Female; Functional magnetic resonance imaging; Habenula; Habenula - diagnostic imaging; Habenula - physiology; Humans; Image processing; Magnetic Resonance Imaging - methods; Male; Mental depression; Neural networks; Neuroimaging; Nucleus basalis; Rodents; Seed-based functional connectivity; Septum; Spatial discrimination; Stria terminalis; Thalamus; Ventral tegmentum; Young Adult; Depression; Anxiety; 7T; Seed-based functional connectivity
• ISSN: 1053-8119; 1095-9572
• DOI: 10.1016/j.neuroimage.2016.10.034

The habenula, a portion of the epithalamus, is implicated in the pathophysiology of depression, anxiety and addiction disorders. Its small size and connection to other small regions prevent standard human imaging from delineating its structure and connectivity with confidence. Resting state functional connectivity is an established method for mapping connections across the brain from a seed region of interest. The present study takes advantage of 7T fMRI to map, for the first time, the habenula resting state network with very high spatial resolution in 32 healthy human participants. Results show novel functional connections in humans, including functional connectivity with the septum and bed nucleus of the stria terminalis (BNST). Results also show many habenula connections previously described only in animal research, such as with the nucleus basalis of Meynert, dorsal raphe, ventral tegmental area (VTA), and periaqueductal grey (PAG). Connectivity with caudate, thalamus and cortical regions such as the anterior cingulate, retrosplenial cortex and auditory cortex are also reported. This work, which demonstrates the power of ultra-high field for mapping human functional connections, is a valuable step toward elucidating subcortical and cortical regions of the habenula network.