Noxious heat induces fMRI activation in two anatomically distinct clusters within the nucleus accumbens.
Using functional magnetic resonance imaging (fMRI) we found that a noxious thermal stimulus (46 degrees C) to the hand activates the nucleus accumbens (NAc) in humans, while a non-noxious warm stimulus (41 degrees C) does not. Following the noxious stimulus, two distinct foci of decreased activation were observed showing distinct time course profiles. One focus was anterior, superior, and lateral and the second that was more posterior, inferior, and medial. The anatomical segregation may correlate with the functional components of the NAc, i.e., shell and core. The results support heterogeneity of function within the NAc and have implications for the understanding the contribution of NAc function to processing of pain and analgesia.
Aharon
I
I
Athinoula Martinos NMR Center for Medical Imaging, Massachusetts General Hospital, USA.
Becerra
L
L
Becerraa
L
L
Chabris
C F
CF
Borsook
D
D
Borsooka
D
D
D000328:Adult; D001931:Brain Mapping; D000077463:Carbamide Peroxide; D016000:Cluster Analysis; D004338:Drug Combinations; D007839:Functional Laterality / Q000502:physiology; D006358:Hot Temperature / Q000009:adverse effects*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging; D008297:Male; D009714:Nucleus Accumbens / Q000033:anatomy & histology / Q000098:blood supply*; D010146:Pain / Q000209:etiology / Q000473:pathology*; D010147:Pain Measurement / Q000379:methods; D010545:Peroxides / Q000097:blood; D010812:Physical Stimulation / Q000379:methods; D013997:Time Factors; D014508:Urea / Q000031:analogs & derivatives / Q000097:blood
D004338:Drug Combinations; D010545:Peroxides; D000077463:Carbamide Peroxide; D014508:Urea