Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Are brain functions really additive?

J J Sidtis1, S C Strother, J R Anderson

  • 1Laboratory of Quantitative Neurology, University of Minnesota Medical School, 420 Delaware Street SE, Minneapolis, Minnesota 55455, USA.

Neuroimage
|May 18, 1999
PubMed
Summary

Positron Emission Tomography (PET) studies reveal that subtracting brain activity between tasks does not accurately represent complex behaviors. This decomposition method failed to demonstrate task additivity, challenging common neuroimaging analysis techniques.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Activation pattern reproducibility: measuring the effects of group size and data analysis models.

Human brain mapping·2010
Same author

Magnetic resonance image tissue classification using a partial volume model.

NeuroImage·2001
Same author

Qualitative and quantitative evaluation of six algorithms for correcting intensity nonuniformity effects.

NeuroImage·2001
Same author

Effects of changes in experimental design on PET studies of isometric force.

NeuroImage·2001
Same author

Multivariate predictive relationship between kinematic and functional activation patterns in a PET study of visuomotor learning.

NeuroImage·2000
Same author

Comparison of voxel- and volume-of-interest-based analyses in FDG PET scans of HIV positive and healthy individuals.

Journal of nuclear medicine : official publication, Society of Nuclear Medicine·2000

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neuroimaging

Background:

  • Positron Emission Tomography (PET) and functional magnetic resonance imaging (fMRI) frequently use subtraction methods to analyze brain activity during complex tasks.
  • Direct evaluation of the subtraction technique's validity in decomposing complex behaviors is limited.

Purpose of the Study:

  • To directly examine the validity of the subtraction method in neuroimaging by comparing complex task analysis with constituent component analysis.
  • To investigate whether task additivity, a prerequisite for accurate subtraction, holds true in motor speech tasks.

Main Methods:

  • Positron Emission Tomography (PET) was employed to study three motor speech tasks: syllable repetition, phonation, and repetitive lip closure.
  • Experiment 1 involved 13 volunteers in separate scanning sessions for each task.

Related Experiment Videos

  • Experiment 2 included 6 volunteers performing all three tasks within a single scanning session.

    • Main Results:

    • Decomposition by compound subtraction yielded significantly different results compared to comparing individual tasks against a baseline condition.
    • These differences were observed regardless of whether tasks were studied in separate sessions or combined within one session.
    • The study failed to demonstrate task additivity for the investigated motor speech tasks.

    Conclusions:

    • The common subtraction method in PET and fMRI may not accurately characterize brain activity for complex behaviors.
    • Task additivity is a critical assumption for the subtraction technique, and its absence challenges the interpretation of complex cognitive processes using this approach.
    • Further research is needed to refine neuroimaging analysis techniques for complex cognitive tasks.