Detection of the brain response during a cognitive task using perfusion-based event-related functional MRI

Neuroreport. 2000 Aug 3;11(11):2533-6. doi: 10.1097/00001756-200008030-00037.

Abstract

Event-related (ER) fMRI has evoked great interest due to the ability to depict the dynamic features of human brain function during various cognitive tasks. Thus far, all cognitive ER-fMRI studies have been based on blood oxygenation level-dependent (BOLD) contrast techniques. Compared with BOLD-based fMRI techniques, perfusion-based fMRI is able to localize the region of neuronal activity more accurately. This report demonstrates, for the first time, the detection of the brain response to a cognitive task using high temporal resolution perfusion-based ER-fMRI. An English verb generation task was used in this study. Results show that perfusion-based ER-fMRI accurately depicts the activation in Broca's area. Average changes in regional relative cerebral blood flow reached a maximum value of 30.7% at approximately 6.5 s after the start of stimulation and returned to 10% of the maximum value at approximately 12.8 s. Our results show that perfusion-based ER-fMRI is a useful tool for cognitive neuroscience studies, providing comparable temporal resolution and better localization of brain function than BOLD ER-fMRI.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adult
  • Cerebral Cortex / anatomy & histology*
  • Cerebral Cortex / metabolism*
  • Cerebrovascular Circulation / physiology
  • Cognition / physiology*
  • Evoked Potentials / physiology*
  • Frontal Lobe / anatomy & histology
  • Frontal Lobe / metabolism
  • Humans
  • Magnetic Resonance Imaging
  • Male
  • Middle Aged
  • Neuropsychological Tests
  • Psychomotor Performance / physiology
  • Verbal Behavior / physiology*