Somatotopy of the human arm using fMRI.
Servos, Philip 2,4; Zacks, Jeff 1; Rumelhart, David E. 1; Glover, Gary H. 3
[Miscellaneous Article]
Neuroreport.
9(4):605-609, March 9, 1998.
(Format: HTML, PDF)
WE describe a technique for mapping out human somatosensory cortex using functional magnetic resonance imaging (fMRI). To produce cortical activation, a pneumatic apparatus presented subjects with a periodic series of air puffs in which a sliding window of five locations moved along the ventral surface of the left arm in a proximal-to-distal or distal-to-proximal direction. This approach, in which the phase-delay of the stimulus can be used to produce somatotopic maps of somatosensory cortex, is based on a method used to generate retinotopic maps of visual cortex. Functional images were acquired using an echoplanar 1.5T scanner and a T2*- weighted spiral acquisition pulse sequence. The periodic series of air puffs created phase-related activation in two cortical regions of the contralateral parietal lobe, the posterior bank of the central sulcus and a more posterior and lateral region.
(C) Lippincott-Raven Publishers.