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Discrimination of Exner's area and the frontal eye field in humans--functional magnetic resonance imaging during

Kayako Matsuo1, Chikako Kato, Chika Sumiyoshi

  • 1Medical Vision Laboratory, Life Electronics Research Center, AIST, 1-8-31, Midorigaoka, Ikeda, Osaka, Japan. kayako.matsuo@aist.go.jp

Neuroscience Letters
|March 22, 2003
PubMed
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This study used fMRI to differentiate Exner's area (EXA), for reading and writing, from the frontal eye field (FEF), for eye movements. Researchers successfully mapped these distinct brain regions, located 1.5 cm apart, using specific saccade and language tasks.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Exner's area (EXA) and the frontal eye field (FEF) are critical left frontal lobe regions.
  • EXA is associated with reading and writing, while FEF controls eye movements.
  • Distinguishing these anatomically and functionally distinct areas is crucial for understanding brain function.

Purpose of the Study:

  • To anatomically and functionally differentiate Exner's area (EXA) from the frontal eye field (FEF).
  • To map the precise locations of EXA and FEF using non-invasive neuroimaging techniques.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed in 12 healthy volunteers.
  • Participants underwent a saccadic eye movement task to activate FEF.

Related Experiment Videos

  • Three language tasks involving grapheme-phoneme translation were used to activate EXA.

    • Main Results:

    • The saccadic eye movement task successfully activated a region identified as FEF.
    • Language tasks specifically activated a distinct region identified as EXA.
    • EXA and FEF were found to be located approximately 1.5 cm apart in the Talairach brain template.

    Conclusions:

    • This study successfully discriminated between Exner's area (EXA) and the frontal eye field (FEF) using fMRI.
    • The findings highlight the distinct functional roles and spatial proximity of these two important brain regions.
    • Simultaneous testing of saccade and language tasks within individuals provides a robust method for separating EXA and FEF.