Unsupervised time course analysis of functional magnetic resonance imaging (fMRI) using self-organizing maps (SOMs)

1999 ◽  
Author(s):  
Stephan G. Erberich ◽  
Matthias Fellenberg ◽  
Timo Krings ◽  
Stefan Kemeny ◽  
Wolfgang Reith ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Time Course ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Self Organizing Maps ◽  
Self Organizing

Self-organizing map (SOM) neural net for the analysis of event-related functional magnetic resonance imaging (efMRI)

NeuroImage ◽  
2000 ◽  
Vol 11 (5) ◽  
pp. S558 ◽  
Author(s):  
Stephan G. Erberich ◽  
Klaus Willmes ◽  
Thomas Dietrich ◽  
Timo Krings ◽  
Armin Thron ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Neural Net ◽  
Self Organizing Map ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Self Organizing

Analysis of blocked single control-activation epoch functional magnetic resonance imaging (fMRI) by Self-organizing map neural net

NeuroImage ◽  
2000 ◽  
Vol 11 (5) ◽  
pp. S559
Author(s):  
Stephan G. Erberich ◽  
Klaus Willmes ◽  
Thomas Dietrich ◽  
Timo Krings ◽  
Armin Thron ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Neural Net ◽  
Self Organizing Map ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Control Activation ◽  
Self Organizing

Functional Magnetic Resonance Imaging Measures of Blood Flow Patterns in the Human Auditory Cortex in Response to Sound

1998 ◽  
Vol 41 (3) ◽  
pp. 538-548 ◽  
Author(s):  
Sean C. Huckins ◽  
Christopher W. Turner ◽  
Karen A. Doherty ◽  
Michael M. Fonte ◽  
Nikolaus M. Szeverenyi
Keyword(s):  
Magnetic Resonance Imaging ◽  
Blood Flow ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Speech Stimuli ◽  
Complex Stimuli ◽  
Scanning Session ◽  
Auditory Research

Functional Magnetic Resonance Imaging (fMRI) holds exciting potential as a research and clinical tool for exploring the human auditory system. This noninvasive technique allows the measurement of discrete changes in cerebral cortical blood flow in response to sensory stimuli, allowing determination of precise neuroanatomical locations of the underlying brain parenchymal activity. Application of fMRI in auditory research, however, has been limited. One problem is that fMRI utilizing echo-planar imaging technology (EPI) generates intense noise that could potentially affect the results of auditory experiments. Also, issues relating to the reliability of fMRI for listeners with normal hearing need to be resolved before this technique can be used to study listeners with hearing loss. This preliminary study examines the feasibility of using fMRI in auditory research by performing a simple set of experiments to test the reliability of scanning parameters that use a high resolution and high signal-to-noise ratio unlike that presently reported in the literature. We used consonant-vowel (CV) speech stimuli to investigate whether or not we could observe reproducible and consistent changes in cortical blood flow in listeners during a single scanning session, across more than one scanning session, and in more than one listener. In addition, we wanted to determine if there were differences between CV speech and nonspeech complex stimuli across listeners. Our study shows reproducibility within and across listeners for CV speech stimuli. Results were reproducible for CV speech stimuli within fMRI scanning sessions for 5 out of 9 listeners and were reproducible for 6 out of 8 listeners across fMRI scanning sessions. Results of nonspeech complex stimuli across listeners showed activity in 4 out of 9 individuals tested.

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