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uchicago-computation-workshop / marc_berman

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Frequency versus amplitude of fluctuation #12

Open yundai424 opened 5 years ago

yundai424 commented 5 years ago

Thanks for contributing such an excellent research! I'm not so familiar with neuroscience, so I get a bit curious about the selection of variables used in the measurement of cognitive effort. Measuring the fluctuation does make perfect sense, but it seems to be right that the amplitude of fluctuation also counts. Is it possible to consider amplitude when representing the cognitive effort, or it is hard to implement since the attempt to capture the amplitude of instantaneous signals may result in high inaccuracy?

bermanm commented 5 years ago

Most univariate analyses of fMRI data examine amplitude, but only to stimulus locked signals. Here we are examining the whole time-series as a state.

I am a little confused though because the DFA measure is taking into account the amplitude/size of the fluctuations.