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Presumably, cardiac rhythms drive a variety of mechanical influence on spontaneous neural firing/neural noise. E.g., temperature changes, even physically 'bumping' into neurons. Does anyone have data, or better a video, showing how low-frequency neural noise is linked to pulse?
If you place an electrode near a capillary or major cerebral artery, will you see a stronger amplitude of low frequency fluctuations? More noisy firing rates? Any demo of this?
Sorry if this is a dumb question, but it's been bugging me and I seem to not be searching the right keywords for this obvious question.
For example, in this 'amplified' MRI you can see how pulsatile motion 'shakes' the entire brain at each heart-beat. There must be references on what this does to baseline firing rates? From researchgate.net/publication/29…
Better gif, from one of their more recent papers. (Terem et al., 2018)
This paper from Moore and Cao nicely explains how blood-flow regulated changes in cerebral temperature could alter neural firing rates. ncbi.nlm.nih.gov/pmc/articles/P… 
Unclear from those citations however if this would work at a beat-to-beat level. I guess it depends on core body temperature.
Another interesting fact is that your eyeball and presumably retina pulsate with the heartbeat. Presumably this has an effect on the visual system - but what? ncbi.nlm.nih.gov/pmc/articles/P…
Given that folks have tried to show that the visual system can detect a single photon, you would think someone would try to see if this flood of blood in the retina influences visual processing? Searching for that evidence now.
Here is a youtube video showing that pulsation on the optic disc.
Here it is as a GIF using Doppler optical coherence tomography nature.com/articles/s4159…
