It's you who brought up the electrical impulse bit. So that is about where it comes from. Not what the manifestation / effect is like.
Not really, as psychology studies a phenomenon which originates in / emerges from physical brains.
In computers, to use a close analogy, there is hardware and software. The hardware is more tangible, while software is more ethereal, being composed of symbols and code instead of nuts and bolts. A glitch in the software can make the hardware not perform improperly, just as a defect in the hardware can make the software not perform properly. Both are needed to work well to get the entire affect. Grief causes a bug in the software, which can create physical symptoms in the hardware. Drug addiction can cause physical changes in the hardware, which can causes bugs in the software; operating system of the brain.
The problem is the philosophy of science requires that we observe phenomena in the third person so we can objectively view the subject. Since this means sensory system this allows others to confirm our discoveries through the third person. However, you cannot see software in the same way as hardware. Software requires introspection; in the first person, so you can look at the code. But this is not allowed by the philosophy of science, since others cannot look inside your mind the same way, you as the first person.
For example, dreams cannot be fully investigated by the philosophy of science since the details can only be seen by the individual who is dreaming. We can know they are dreaming, via the third person by REM and other hardware output. However, the details cannot be seen by any machine, but only in the first person by the person who is dreaming. Dreams cannot be addressed fully by science since your dreams cannot be reproduced as defined by the philosophical code.
Psychology has to depend on the patient to tell them this insider; first person, information so they can figure out the software glitch. They need to look for cues to make sure this is the truth and not a game. This is called soft science since it depends on unique data provided by the patient that is not subject to verification like the hardware side. It sort of violate the philosophy of science in the that data is not exactly reproducible by other researchers.
Science falls short by its philosophy when dealing with the software side of the brain. This is a final frontier of science and would need an update for in science philosophy. God is found in the software side since he is not physical, like hardware. A Saint is not made due to hardware, but rather by faith which is not a physical thing. It is closer to religious software, which can impact the DNA through epigenetic changes; becomes an instinctive habit.