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Other literature type . 2006
Data sources: PubMed Central
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Human Brain Mapping
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Permutation testing of orthogonal factorial effects in a language‐processing experiment using fMRI

Authors: Suckling, J; Davis, MH; Ooi, O; Wink, AM; Fadili, J; Salvador, R; Welchew, D; +3 Authors

Permutation testing of orthogonal factorial effects in a language‐processing experiment using fMRI

Abstract

The block-paradigm of the Functional Image Analysis Contest (FIAC) dataset was analysed with the Brain Activation and Morphological Mapping software. Permutation methods in the wavelet domain were used for inference on cluster-based test statistics of orthogonal contrasts relevant to the factorial design of the study, namely: the average response across all active blocks, the main effect of speaker, the main effect of sentence, and the interaction between sentence and speaker. Extensive activation was seen with all these contrasts. In particular, different vs. same-speaker blocks produced elevated activation in bilateral regions of the superior temporal lobe and repetition suppression for linguistic materials (same vs. different-sentence blocks) in left inferior frontal regions. These are regions previously reported in the literature. Additional regions were detected in this study, perhaps due to the enhanced sensitivity of the methodology. Within-block sentence suppression was tested post-hoc by regression of an exponential decay model onto the extracted time series from the left inferior frontal gyrus, but no strong evidence of such an effect was found. The significance levels set for the activation maps are P-values at which we expect <1 false-positive cluster per image. Nominal type I error control was verified by empirical testing of a test statistic corresponding to a randomly ordered design matrix. The small size of the BOLD effect necessitates sensitive methods of detection of brain activation. Permutation methods permit the necessary flexibility to develop novel test statistics to meet this challenge.

International audience

Countries
Netherlands, France, France
Subjects by Vocabulary

Microsoft Academic Graph classification: Design matrix Mathematics Main effect Sentence Type I and type II errors Permutation Test statistic Statistical hypothesis testing business.industry Nonparametric statistics Pattern recognition Artificial intelligence business

Keywords

Software Validation, permuation, wevelet, Functional Laterality, Image Processing, Computer-Assisted, FIAC, Research Articles, Language, Cerebral Cortex, Brain Mapping, Language Tests, Radiological and Ultrasound Technology, Magnetic Resonance Imaging, Temporal Lobe, Frontal Lobe, Neurology, [INFO.INFO-TI]Computer Science [cs]/Image Processing [eess.IV], Cerebrovascular Circulation, Speech Perception, functional MRI, Anatomy, non parametric, Algorithms, [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS], Humans, Radiology, Nuclear Medicine and imaging, Models, Statistical, Neural Inhibition, Neurology (clinical), Software

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    impulse
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    Top 10%
  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    31
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
31
Average
Top 10%
Top 10%
Green
gold