WOBIB: 72 - Becerra, et al. (1999) Human brain activati ...
 
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L. R. Becerra; H. C. Breiter; M. Stojanovic; S. Fishman; A. Edwards; A. R. Comite; R. G. Gonzalez; D. Borsook. Human brain activation under controlled thermal stimulation and habituation to noxious heat: an fMRI study. Magnetic Resonance in Medicine 41(5):1044-57, 1999. PMID: 10332889. WOBIB: 72.

Brain activity was studied with functional magnetic resonance imaging (fMRI) following thermal stimulation. Two groups (n = 6/group) of human male volunteers were given up to four noxious (46 degrees C) and four non-noxious (41 degrees C) stimuli. In the 46 degrees C experiment, positive signal changes were found in the frontal gyri, anterior and posterior cingulate gyrus, thalamus, motor cortex, somatosensory cortex (SI and SII), supplementary motor area, insula, and cerebellum. Low-level negative signal changes appeared in the amygdala and hypothalamus. All regions activated by 46 degrees C were also activated by 41 degrees C. However, except for SI and thalamus, significantly more activation was observed for the 46 degrees C stimulus. A significant attenuation of the signal change was observed by the third stimulus for the 46 degrees C, but not for 41 degrees C experiment. Similar findings were replicated in the second group. These fMRI findings specify differences between somatosensory and pain sensation and suggest a number of rich avenues for future research.

Asymmetry: 0.27167 (left: -1, right: +1)

VRML2 file (136 Kb)

1 Hot pain on left hand (group 1). 46 degrees hot pain to the dorsum of the left hand versus 35 degree stimuli. WOEXP: 225.
2 Warmth on left hand (group 1). 41 degrees warm stimuli to the dorsum of the left hand versus 35 degree stimuli. WOEXP: 226.
3 Hot pain on left hand (group 2). 46 degrees hot pain to the dorsum of the left hand versus 35 degree stimuli. WOEXP: 227.


corner cube of WOBIB_72

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