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A problem of overlap.

Roger B Tootell1, Cesar Echavarria1, Shahin Nasr1

  • 1Athinoula A. Martinos Center for Biomedical Imaging,Massachusetts General Hospital,Charlestown,Massachusetts.

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Summary
This summary is machine-generated.

Researchers propose a new area, the MT crescent (MTc), may explain the apparent overlap between visual areas LO and MT(+) in human brain imaging. This finding could resolve inconsistencies in functional magnetic resonance imaging (fMRI) studies.

Keywords:
LOCMTMTcVisual cortexfMRI

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Area of Science:

  • Neuroscience
  • Visual Neuroscience
  • Human Brain Imaging

Background:

  • Functional magnetic resonance imaging (fMRI) studies in humans suggest overlap between visual areas LO and MT(+).
  • This apparent overlap is problematic and inconsistent with distinct functional specializations.
  • Primate studies reveal a region surrounding MT, the MT crescent (MTc), with intermediate properties.

Purpose of the Study:

  • To propose the existence and role of the MT crescent (MTc) in human visual cortex.
  • To explain the observed functional overlap between LO and MT(+) in human fMRI data.
  • To reconcile human fMRI findings with nonhuman primate neuroanatomy.

Main Methods:

  • Review of existing primate neuroanatomical and electrophysiological data.
  • Hypothesizing the presence and location of MTc in human visual cortex.
  • Computational modeling to simulate fMRI results based on the proposed MTc structure.

Main Results:

  • A proposed model suggests that the MT crescent (MTc) could account for the apparent overlap between LO and MT(+) in human fMRI.
  • This model assumes MTc exists in humans and has functional properties intermediate to LO and MT(+).
  • Simulations confirmed that this arrangement can generate the observed overlap in conventional fMRI localizer experiments.

Conclusions:

  • The MT crescent (MTc) is a plausible explanation for the functional overlap between LO and MT(+) in human visual cortex.
  • This hypothesis resolves a puzzling finding in human fMRI literature.
  • Further research is needed to empirically verify the existence and function of MTc in the human brain.