English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  fMRI of the temporal lobe of the awake macaque at 7T

Goense, J., Ku, S.-P., Tolias, A., & Logothetis, N. (2005). fMRI of the temporal lobe of the awake macaque at 7T. Poster presented at 35th Annual Meeting of the Society for Neuroscience (Neuroscience 2005), Washington, DC, USA.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-D3B5-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-D3B6-5
Genre: Poster

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Goense, J1, Author              
Ku, S-P1, Author              
Tolias, AS1, Author              
Logothetis, NK1, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              

Content

show
hide
Free keywords: -
 Abstract: The temporal lobe of the primate brain is thought to be important in high-level object recognition and learning. In contrast to electrophysiological studies, fMRI has the advantage that it allows simultaneous mapping of the functional organization of multiple cortical areas. However, there are few fMRI studies of the inferior temporal lobe in the non-human primate, because gradient-echo echo-planar-imaging (GE-EPI), which is commonly used, suffers from susceptibility related signal losses due to the ear canal and the cancellous nature of the temporal bone. The large macroscopic susceptibility gradients caused by air-tissue interfaces result in distortion and reduced signal-to-noise in affected areas. At high magnetic fields this is especially problematic, because in addition to increases in the BOLD signal, the susceptibility artifacts also increase. In areas of high susceptibility, using spin-echo EPI (SE-EPI) may be advantageous because it is less sensitive than GE-EPI to susceptibility artifacts, and does not suffer from signal dropout in these regions. In this study, we compare SE-EPI and gradient-echo fMRI in the awake monkey (Macaca mulatta), using a vertical bore 7T MR system. An 8 cm surface coil was positioned over the monkey’s ear, which covers one hemisphere, allowing imaging of the major visual areas. The imaging parameters and slice orientation were optimized to minimize susceptibility effects. Resolution was typically 1.5x2x2mm, TE was 40 ms, TR was 1-2 s. In contrast to the GE-EPI images, which showed very large signal dropout in the temporal lobe, SE images showed minimal or no distortion or signal losses. Using movies as a stimulus, reliable functional activation was obtained in the inferior temporal lobe (as well as in other visual areas). The reliability and specificity of the obtained activations with SE-EPI ensures the application of the method in our on-going visual perception and learning studies.

Details

show
hide
Language(s):
 Dates: 2005-11
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: URI: http://www.sfn.org/absarchive/
BibTex Citekey: 3835
 Degree: -

Event

show
hide
Title: 35th Annual Meeting of the Society for Neuroscience (Neuroscience 2005)
Place of Event: Washington, DC, USA
Start-/End Date: -

Legal Case

show

Project information

show

Source

show