Hi Craig Highlighting the word 'spontaneous' with astereixes doesnt show anything. Here 'spontaneous' just means 'originates in the brain in the absence of external stimuli'. This kind of activity is often refered to as 'task unrelated' which is to say it is not activity that is bound to some external task. Daydreaming and remembering past events are common examples. You shouldn't confuse it with the idea of uncaused activity which evidently you have done.
All the best. --- Original Message --- From: "Craig Weinberg" <whatsons...@gmail.com> Sent: 3 September 2013 2:48 AM To: everything-list@googlegroups.com Subject: Re: Spontaneous Brain Activity Controls Behavior > > "Finally, there was a pronounced difference in the effect of regressing > out *spontaneous* activity on the left SMC BOLD-behavior relationship > with instructed versus *spontaneous * force variability. With *spontaneous > * force variability, regression of *spontaneous* (right SMC) activity all > but eliminated the left SMC BOLD-behavior relationship. In contrast, with > instructed force variability regressing out *spontaneous* activity > increased the significance of the left SMC BOLD-behavior effect. This > improvement in significance suggests that regression of *spontaneous*activity > removed noise that was independent of the BOLD-behavior effect in > the instructed condition. This finding is important as it shows that an > ipsilateral response alone is not sufficient to eliminate the BOLD-behavior > effect by regression as seen with* spontaneous* force variability. > > *In summary, there are three pronounced differences between spontaneous > and instructed force variability in the current experiment: (1) the > reversal of the time course magnitudes, (2) the difference in the timing of > the significant BOLD-behavior effect, and (3) the difference in the effect > of regressing out spontaneous activity. As such, we can be relatively > confident that spontaneous and instructed force variability represent > distinct phenomena in the current experiment. "* > The study speaks for itself. What I think it means is what the researchers also think it means. I don't know what you could imagine it would mean otherwise. Spontaneous is used here in an ordinary way, not in some obscure medical jargon which somehow actually means "anything but spontaneous". The whole experiment is about isolating spontaneous activity from other types of activity which respond to known conditions. You are welcome to explain exactly what you think this study shows in your terms, but don't bother if you are just going to throw out unsupported opinions. Thanks, Craig On Monday, September 2, 2013 11:18:31 AM UTC-4, stathisp wrote: > > > > The article doesn't show what you think it shows. "Spontaneous" doesn't > mean what you think it means. > > On 02/09/2013, at 12:35 PM, Craig Weinberg <whats...@gmail.com<javascript:>> > wrote: > > > http://ac.els-cdn.com/S0896627307006666/1-s2.0-S0896627307006666-main.pdf?_tid=4e78eb70-1321-11e3-bc23-00000aab0f01&acdnat=1378052132_997e220cfcf62a6d02d5ccd22660a221 > > > The resting brain is not silent, but exhibits organized fluctuations in > neuronal activity even in the absence of tasks or stimuli. This intrinsic > brain activity persists during task performance and contributes to > variability in evoked brain responses. What is unknown is if this intrinsic > activity also contributes to variability in behavior. In the current fMRI > study, we identify a relation- ship between human brain activity in the > left somatomotor cortex and spontaneous trial-to-trial variability in > button press force. We then demonstrate that 74% of this brain-behavior > relationship is attributable to ongoing fluctuations in intrinsic activity > similar to those observed during resting fixation. > > The resting brain is not silent, but exhibits organized fluctuations in > neuronal activity even in the absence of tasks or stimuli. This intrinsic > brain activity persists during task performance and contributes to > variability in evoked brain responses. What is unknown is if this intrinsic > activity also contributes to variability in behavior. In the current fMRI > study, we identify a relation- ship between human brain activity in the > left somatomotor cortex and spontaneous trial-to- trial variability in > button press force. We then demonstrate that 74% of this brain-behavior > relationship is attributable to ongoing fluctuations in intrinsic activity > similar to those observed during resting fixation - See more at: > http://s33light.org/post/60036139333#sthash.sgzmIpwx.dpuf > The resting brain is not silent, but exhibits organized fluctuations in > neuronal activity even in the absence of tasks or stimuli. This intrinsic > brain activity persists during task performance and contributes to > variability in evoked brain responses. What is unknown is if this intrinsic > activity also contributes to variability in behavior. In the current fMRI > study, we identify a relation- ship between human brain activity in the > left somatomotor cortex and spontaneous trial-to- trial variability in > button press force. We then demonstrate that 74% of this brain-behavior > relationship is attributable to ongoing fluctuations in intrinsic activity > similar to those observed during resting fixation - See more at: > http://s33light.org/post/60036139333#sthash.sgzmIpwx.dpuf > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to everything-li...@googlegroups.com <javascript:>. > To post to this group, send email to everyth...@googlegroups.com<javascript:> > . > Visit this group at http://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/groups/opt_out. > > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
