R. Frackowiak

Publications1,403
h-index126
Citations63,684
Highly Influential Citations2,854
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Assessing the significance of focal activations using their spatial extent
TLDR
The results mean that detecting significant activations no longer depends on a fixed threshold, but can be effected at any (lower) threshold, in terms of the spatial extent of the activated region.
View on Wiley
Movement‐Related effects in fMRI time‐series
TLDR
The empirical analyses suggest that (in extreme situations) over 90% of fMRI signal can be attributed to movement, and that this artifactual component can be successfully removed.
View on Wiley
Functional Connectivity: The Principal-Component Analysis of Large (PET) Data Sets
TLDR
The results suggest that the variance in neurophysiological measurements, introduced experimentally, was accounted for by two independent principal components and highlighted an intentional brain system seen in previous studies of verbal fluency.
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Comparing Functional (PET) Images: The Assessment of Significant Change
TLDR
This report describes an approach that may partially resolve the uncertainty in assessing the significance of statistical parametric maps and models the SPM as a stationary stochastic process.
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A direct demonstration of functional specialization in human visual cortex
TLDR
PET is used to demonstrate directly the specialization of function in the normal human visual cortex, and provides direct evidence to show that, just as in the macaque monkey, different areas of the human prestriate visual cortex are specialized for different attributes of vision.
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Other minds in the brain: a functional imaging study of “theory of mind” in story comprehension
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Functional anatomy of the mental representation of upper extremity movements in healthy subjects.
TLDR
Investigating differences in the distribution of relative regional cerebral blood flow during motor imagery and execution of a joy-stick movement with positron emission tomography suggested that imagined movements can be viewed as a special form of "motor behavior' that activate areas associated heretofore with selection of actions and multisensory integration.
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Characterizing Evoked Hemodynamics with fMRI
TLDR
Using this approach, the anterior cingulate differentiates, in terms of its response, between two motor tasks that did and did not require sustained attention, and it is suggested that these demonstration results point to the possibility of making greater use of the temporal resolution afforded by fast fMRI techniques.
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Willed action and the prefrontal cortex in man: a study with PET
TLDR
Willed acts in the two response modalities studied (speaking a word, or lifting a finger) were associated with increased blood flow in the dorsolateral prefrontal cortex (Brodmann area 46) and decreases in blood flow were also associated, but the location of these decreases was modality dependent.
View on Royal Society
Characterizing Dynamic Brain Responses with fMRI: A Multivariate Approach
TLDR
A multivariate analysis of evoked hemodynamic responses and their spatiotemporal dynamics as measured with fast fMRI reveals some compelling and somewhat unexpected perspectives on transient but stereotyped responses to changes in cognitive or sensorimotor processing.
View on Elsevier
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