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Clarify raw and computed physiological data definitions#49

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rawvsderivatives
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Clarify raw and computed physiological data definitions#49
smoia wants to merge 1 commit intobep045from
rawvsderivatives

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@smoia smoia commented Feb 26, 2026

Added clarification on raw vs computed physiological data and recommendations for data recording.

Closes #11

Added clarification on raw vs computed physiological data and recommendations for data recording.

Closes #11
Examples of computed metrics are heart rate, ...
Some modalities could be both, e.g. blood pressure directly measured vs computed from PPG signals.

In the following document, we broadly categorise any computed metric as non-raw data, although currently
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It concerns me that this could be interpreted as non-raw = BIDS derivative, so we should maybe explicitly clarify that this is not the case.

To complicate the matter, certain devices allow analog signal processing operations.

Examples of directly measured physiological fluctuations include respiration, cardiac pulse, or eye-tracking.
Examples of computed metrics are heart rate, ...
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Should more examples be specified here other than HR ?

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@m-miedema m-miedema Mar 12, 2026

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Yes, I think EDA is a nice one! Do we use "proc" to reflect e.g. phasic vs tonic components?

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m-miedema commented Mar 12, 2026

@smoia points out that we recommend saving the 'rawest' data possible, without clarifying what we mean by this... We could change our wording to minimally processed?

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m-miedema commented Mar 12, 2026

A lingistic clarification I suggest:

BIDS: raw vs. derivative
physio: unprocessed vs. processed

A transformation of the measured signal --> use proc
(here processed relates to a computed metric or transformation of the data e.g. filter that changes signal's spectral content significantly e.g. EDA tonic or phasic, SCR)

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@ShiyuBelleWang suggests strongly recommending proc for sparse data

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smoia commented Mar 12, 2026

Mary:

BIDS: raw vs. derivative
physio: unprocessed vs. processed

where processed relates to a computed metric or transformation of the data

EDA tonic and phasic are transformation due to filtering and bandwidth

BP acquired on-skin is unprocessed, BP coming from Pulse is processed

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