nerve impulses move at a certain speed, with a decrease in a person (if we discard the actual impossibility of such a thing) they will have to travel a shorter path, therefore the reaction speed should increase and everything will look slower than at normal size.
I came to this question through another question: How will a reduced person perceive temperatures? That is: will a cup of tea cool down in the same 15 minutes as usual, or at the same rate as the whole barrel cools? Indeed, with our decrease, when a person sees everything at the same speed, the cup will become a barrel or a huge cistern. If the tank cools down in the same way in 15 minutes, then the reduced person will die from the cold, or he will have to move, eat and speed up his metabolism as many times as it has decreased. Another option: its decrease will take place so that he will see everything previously habitual slowed down and the temperature will change very slowly, so that he will perceive the ignition of a match as a slow explosion ..
I'm not very sure, but I think so. Everything will seem farther than normal. Just like with an airplane in the sky, because the airplane flies at a very high speed, but for those on the ground it seems slow. Forgive me in advance for being wrong, but this is how I imagine it.
The answer is yes. This topic was investigated by Irish scientists - the determination of the critical flicker fusion frequency (CFF). The experiment involved more than 30 species of animals. Subjects observed flashes of light of different frequencies. The bottom line is that if the frequency is lower than CFFF, then the animal distinguishes outbreaks separately, and if higher, then it sees an even flickering stream of light. Bottom line: the smaller the animal, the more flashes it perceives per unit of time, the animal's brain has time to process them.
Time perception depends on how quickly the animal's nervous system processes sensory information. Animals that are able to distinguish flickering at high frequencies perceive time with high resolution. Movements and events will unfold more slowly for them.
Dogs perceive visual information a quarter faster than us. Therefore, 24 frames in a movie are not enough for them to see a uniformly moving image. Instead, they watch a kind of "slideshow" of frequently changing frames. The fly sees us as moving 4 times slower than we feel. But for the leatherback turtle we are all Benny Hill characters.