Why do arachnids/insects move in low-frame-rate-like quick burst movements?

Question

I saw a video of a spider recently moving about and it’s movements were very jerky, almost as if each time it moved a limb about a degree there was a “stopping point” so to speak. It seems their articulation is limited to specific distances, each of which happens in rapid bursts rather than one fluid motion like a human’s. Is this some reflex related thing? Like a limited speed of neurons or ~~quantified~~ proportion of neurotransmitters?

Edit: I’ve seen this with other insects as well as other spiders, even irl. I don’t think it has anything to do with actual camera framerate. It has something to do with arachnids’ and insects’ limited articulation.

In: Biology

Answer 1

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Answer 2

Spider legs move via hydraulic pressure, just like robots do. Their movement is also constricted by the armor of their shells, so even the movements that are muscles, while still more fluid, are going to look stiffer.

The latter is also the case in insects.