Mapping of the central sulcus with functional MR: active versus passive activation tasks

Our purpose was to assess the pattern of functional MR activation obtained with a passive sensory versus an active sensorimotor hand stimulus paradigm. Eight functional MR runs, four with an active sensorimotor (sponge-squeezing) task and four with a passive sensory (palm-finger brushing) reception,...

Full description

Saved in:
Bibliographic Details
Published in:American journal of neuroradiology 1998-05, Vol.19 (5), p.847-852
Main Authors: Lee, CC, Jack, CR, Jr, Riederer, SJ
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Brain - anatomy & histology
Brain - physiology
Brain Mapping - methods
Female
Hand - physiology
Humans
Investigative techniques, diagnostic techniques (general aspects)
Magnetic Resonance Imaging
Male
Medical sciences
Middle Aged
Motor Activity - physiology
Nervous system
Physical Stimulation
Radiodiagnosis. Nmr imagery. Nmr spectrometry
Sensation - physiology
Touch - physiology
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Our purpose was to assess the pattern of functional MR activation obtained with a passive sensory versus an active sensorimotor hand stimulus paradigm. Eight functional MR runs, four with an active sensorimotor (sponge-squeezing) task and four with a passive sensory (palm-finger brushing) reception, were acquired for each of 10 healthy volunteers. Activation maps were generated by thresholding cross-correlation maps. Regions of interests (ROIs) were drawn around the precentral and postcentral gyri on T1-weighted images according to established anatomic criteria, and the number of activated pixels inside the ROIs was ascertained. Displacement of the sensorimotor and sensory activation centroids within the ROIs from the central sulcus as well as from each other was measured. Active sensorimotor stimulation produced a significantly greater number of activation pixels than did passive sensory stimulation. Run-to-run variability was equivalent between sensorimotor and sensory activation tasks. On average, the sensorimotor and sensory activation centroids were located in the postcentral gyrus, and their spatial locations were not significantly different. Active and passive activation tasks produce largely equivalent results. Presurgical mapping of the sensorimotor area can be performed with functional MR imaging using a passive palm-finger brushing task in patients who are physically unable to perform active finger-tapping or hand-squeezing sensorimotor activation tasks.
ISSN:0195-6108
1936-959X