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typos in faq fixed
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ryanhammonds committed Apr 14, 2020
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Expand Up @@ -28,7 +28,7 @@ putative functional roles.

FOOOF operates on frequency representation of neurophysiological times series (power spectra).
At it's core, FOOOF is a fitting procedure to measure these two components - the periodic and
aperiodic components - in power spectra. The full model fit consists of a parameterizing of these
aperiodic components - in power spectra. The full model fit consists of parameterizing these
aperiodic and periodic components, as well as a full (combined) model fit of the whole
power spectrum.

Expand Down Expand Up @@ -79,7 +79,7 @@ and systematically varies both within [1_] and between [2_] subjects.

The dynamic properties of the aperiodic activity means that even if periodic activity
is still the focus of the analysis, quantification of such data must explicitly account
for aperiodic activity to appropriately measure what components of the data are actually
for aperiodic activity to appropriately measure which components of the data are actually
changing.

In addition, aperiodic components of neural signals may be important and interesting
Expand All @@ -101,8 +101,8 @@ frequency ranges, it is not truly '1/f' across all frequencies.
From the physics perspective, '1/f' activity is sometimes referred to as 'noise',
as shorthand for 'statistical noise' or `coloured noise <https://en.wikipedia.org/wiki/Colors_of_noise>`_.
As well as not necessarily meeting technical definitions, referring to aperiodic neural activity
as noise in this way is also different however to how the terms 'signal' & 'noise' are typically
used in neuroscience, in terms of referring to a signal of interest and unwanted or artifactual
as noise in this way is also different to how the terms 'signal' & 'noise' are typically
used in neuroscience, in terms of referring to a signal of interest as unwanted or artifactual
activity. We consider that the aperiodic could be the signal of interest for some investigations.
Therefore, we have moved away from this term so as not to imply it is either strictly statistical
noise, nor is it merely unwanted 'noise' in the recording.
Expand Down Expand Up @@ -136,10 +136,10 @@ If a peak is not detected, in the power spectrum, within a given frequency band,
consistent with there being no periodic activity at that frequency. Without a detected peak,
we argue that there is no evidence of periodic activity, at that frequency, over and
above the power as expected by the aperiodic activity. In this situation, one should be very
wary of interpreting activity at this frequency, as it is most likely to reflect aperiodic
wary of interpreting activity at this frequency, as it is most likely reflects aperiodic
activity.

However, we can, of course not prove a negative, and the absence of a detected peak does
However, we cannot prove a negative, and the absence of a detected peak does
therefore imply that there must be no periodic activity at that frequency band. There could
be very low power periodic activity, and/or periodic activity that is variable through time
(bursty) such as to not display a prominent peak across the analyzed time sample.
Expand Down Expand Up @@ -215,12 +215,12 @@ I'm interested in a particular oscillation band, should I fit a small range?
Generally, no, it is better to always try and fit a broad range, rather than to fit a small
frequency range, even if one is interested in a specific oscillation band in particular.

This is because the if a small frequency range is used, it becomes much more difficult to
This is because if a small frequency range is used, it becomes much more difficult to
estimate the aperiodic component of the data, and without a good estimate of the aperiodic
component, it can also be more difficult to effectively estimate the periodic components.

Therefore, if one is interested in, for example, alpha oscillations (approximately 7-14 Hz),
the we still recommend fitting a broad range (for example, 3-40 Hz), and then extracting the
then we still recommend fitting a broad range (for example, 3-40 Hz), and then extracting the
alpha oscillations post-hoc. There are utilities in fooof.analysis to extract oscillations
from particular bands, and examples of this on the examples page.

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