tag:blogger.com,1999:blog-4402160631955197288.post8906146327055460379..comments2024-03-12T19:57:17.818-07:00Comments on practiCal fMRI: the nuts & bolts: Concomitant physiological changes as potential confounds for BOLD-based fMRI: a (draft) checklistpractiCal fMRIhttp://www.blogger.com/profile/07387300671699742416noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-4402160631955197288.post-25651148788745024472014-11-08T21:26:54.840-08:002014-11-08T21:26:54.840-08:00Effects to come in an updated post:
Glyceryl tri...Effects to come in an updated post: <br /><br />Glyceryl trinitrate<br />Acetazolamide<br />Benzodiazepines (incl Valium)<br />Zolpidem (Ambien)<br />practiCal fMRIhttps://www.blogger.com/profile/07387300671699742416noreply@blogger.comtag:blogger.com,1999:blog-4402160631955197288.post-90294296070616074322014-11-06T19:54:02.905-08:002014-11-06T19:54:02.905-08:00Hi Josh, this post is focused on just the potentia...Hi Josh, this post is focused on just the potential concomitant physiological changes. With the exception of low frequency oscillations and pulsations driven by heart rate, all the whole head/body motion effects aren't intended to appear here. Likewise, other non-biological sources of noise, e.g. thermal drifts in the gradients and RF amplifier, and other scanner instabilities.<br /><br />Cheers!practiCal fMRIhttps://www.blogger.com/profile/07387300671699742416noreply@blogger.comtag:blogger.com,1999:blog-4402160631955197288.post-70248708078631984392014-11-06T16:22:41.394-08:002014-11-06T16:22:41.394-08:00Thanks for the post. You did forget one very impor...Thanks for the post. You did forget one very important source of noise in task fMRI and resting state fcMRI: Head motion. See below for citations.<br /><br />'Statistical Improvements in Functional Magnetic Resonance Imaging Analyses Produced by Censoring High-Motion Data Points' Siegel et al 2014, Human Brain Mapping<br />'Spurious but systematic correlations in functional connectivity MRI networks arise from subject motion' Power et al 2012, NeuroimageJosh Siegelhttps://www.blogger.com/profile/05288125660323286456noreply@blogger.comtag:blogger.com,1999:blog-4402160631955197288.post-19749988414304178722014-11-03T08:41:03.856-08:002014-11-03T08:41:03.856-08:00Additional factor to be included in an updated pos...Additional factor to be included in an updated post: dietary creatine -<br /><br />http://www.ncbi.nlm.nih.gov/pubmed/20570601<br /><br />I would like to hear from anyone who has knowledge of potential physiologic confounds arising out of other dietary compounds, especially amino acids (eg glutamate, tryptophan). Thx!practiCal fMRIhttps://www.blogger.com/profile/07387300671699742416noreply@blogger.comtag:blogger.com,1999:blog-4402160631955197288.post-27159812854013203602014-11-03T08:36:45.684-08:002014-11-03T08:36:45.684-08:00Thanks for the suggestion. This paper, and others,...Thanks for the suggestion. This paper, and others, deals with what I gather are most likely to be neural effects rather than concomitant physiology per se. But I also realize that this distinction is a little arbitrary. So as I consider each candidate effect I am trying to determine if any concomitant physiologic effects are highly localized or whether they are more systemic. The former would, I think, have a better interpretation via (modified) neurovascular coupling. I suppose this is akin to differentiating between specific and sympathetic effects. Cocaine definitely affects neural action, but it also has systemic effects in breathing and heart rate, etc. Now, if menstrual cycle demonstrates changes in breathing or heart rates then we are in business, there is clearly a concomitant change to concern us! Hope this distinction kinda sorta makes sense.practiCal fMRIhttps://www.blogger.com/profile/07387300671699742416noreply@blogger.comtag:blogger.com,1999:blog-4402160631955197288.post-19316628724759978662014-11-02T16:04:17.849-08:002014-11-02T16:04:17.849-08:00BTW: I was quite surprised to read that you couldn...BTW: I was quite surprised to read that you couldn't find articles about menstrual cycle effects on fMRI. There is an article titled "Resting states are resting traits" that seems highly relevant. I couldn't paste a link here, because your blog seems to be hyper-vigilantly protecting you from spam<br /><br />Ariel Rokemhttps://www.blogger.com/profile/10347265826390881146noreply@blogger.comtag:blogger.com,1999:blog-4402160631955197288.post-25050768020052888792014-11-02T15:46:32.750-08:002014-11-02T15:46:32.750-08:00Thanks for putting this together. Things that I am...Thanks for putting this together. Things that I am thinking about a lot these days. <br /><br />Just a small typo: "Docherty" s.b "Dougherty" in the list of authors of our glmedenoise paper. Thanks for mentioning that. Ariel Rokemhttps://www.blogger.com/profile/10347265826390881146noreply@blogger.comtag:blogger.com,1999:blog-4402160631955197288.post-5499677869808705022014-11-02T15:39:25.151-08:002014-11-02T15:39:25.151-08:00Practical, did I ever tell you that your my hero? ...Practical, did I ever tell you that your my hero? What an excellent post. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4402160631955197288.post-10064924579879713252014-10-31T01:03:51.191-07:002014-10-31T01:03:51.191-07:00One more to Breathing and heart rates section
DRIF...One more to Breathing and heart rates section<br /><a href="http://www.ncbi.nlm.nih.gov/pubmed/22281675" rel="nofollow">DRIFTER</a> by Särkkä et alAki Vehtarihttp://becs.aalto.fi/~ave/noreply@blogger.com