On 9/2/2013 9:48 AM, Craig Weinberg wrote:
"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.
It's just like my clock. Every couple of days it gets some external stimuli: I wind it
up. In between its activity is all spontaneous.
Brent
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