The science behind all this is pretty simple honestly.
When you shout you have to inhale first, and that act of inhaling gives you a burst of muscle power. But when you also combine that with a loud exclamation or a shout or curse, you actually startle yourself on some level. Your brain listens to you, always remember that. So when your brain hears you shout or scream, it drops everything and goes into survival mode. IE: a burst of adrenaline.
When you combine adrenaline and oxygen you can do almost super-human things like smash cinderblocks with your bare hands and lift cars off trapped people.
If you want to try charging your muscles for something strenuous like opening a tight jar lid, you can skip the cursing and shouting and just take three deep breaths, and on the last breath draw it in as fast and hard as you can and hold it for a moment as you try to exert the force, it will feel astonishingly easier.


There are massive problems with ideas like individual galaxies making up parts of some kind of galactic neural network where the information being exchanged takes place of billions of years to form some “super thought.”
Not the least of which is that it doesn’t say anything, it’s a stoner thought that for all I know is totally true, but it’s so impossible to either prove, model or test, and it doesn’t provide a more plausible explanation for anything.
We can just as easily say that a handful of gravel I pick up may form some kind of neural network because technically they are sharing information in subtle ways. A panpsychist might say “exactly!” and I just say “Why? What does this idea explain better than the models we have now?”
The other huge problem is the expansion of the universe and the way light behaves. I am not sure the cosmic super entity is doing so hot considering how rapidly it’s tearing itself apart. Since light doesn’t really experience time either way, those “thoughts” trapped in patterns of light rays basically had one moment of thought and then dispersed so far and wide that it was essentially instant. I could easily come up with workarounds that keep the idea alive, but then at that point aren’t we just desperately trying to find God?