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Fig. 3 | The Journal of Headache and Pain

Fig. 3

From: Advantages of imaging photoplethysmography for migraine modeling: new optical markers of trigemino‐vascular activation in rats

Fig. 3

Relative change of the parameters measured in a contactless way by the digital camera (APC, graph a, and OIS, graph b) and invasively (ABP, graph c, and HR, graph d) in response to the CCW electrical stimulation. Here we show the data averaged over 96 baseline measurements carried out in three subsequent trials with three groups of animals before pharmacological interventions. Curves in the graphs show evolution of the mean value while the whiskers are the standard deviations. Yellow color indicates the pre-stimulation phase, the red one marks a 15-seconds period of the electrical stimulation, and the violet is the relaxation phase. Right-side panels (e, f, g and h) illustrate the statistical significance of the respective hemodynamic parameter assessed at the 10th s of the trial (pre-stimulation phase) and at the 30th s of the trial (stimulation phase)

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