Differences

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--- heartbeats [2010/05/28 03:10] – Some small additions jochen
+++ heartbeats [2010/05/28 03:13] – Added some comments jochen
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 ===== Motivation =====
-For many tasks, it is often helpful to collect secondary physiological measurements, such as heart-rate over time. The data processing can be rather complicated.
+For many experimental tasks (e.g. subjects follwing a set of specific but differing instructions), it is often helpful to collect secondary physiological measurements, such as heart-rate over time (both as a manipulation check but also as potential candidates for mediation analysis). The data processing can be rather complicated, and a function to automatize the actual detection of heart beats in the ECG data is helpful.
 ===== Requirements =====
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 {{:ecg_and_hr_overview.png|heartbeats plot figure 2}}
-The second figure shows the entire signal over time in a 20Hz sampling (in blue) with the detected heart-rate super-imposed to control for flaws in the detection. This can be done by zooming in on a smaller piece of the signal:
+The second figure shows the entire signal over time in a 20Hz sampling (in blue) with the detected heart-rate (which is rescaled to 2.5 + BPM/60) super-imposed to control for flaws in the (initial auto-) detection. This can be done by zooming in on a smaller piece of the signal:
 {{:ecg_and_hr_zoomed.png|heartbeats plot figure 2 - zoomed}}.