Sight control feedback loop4/29/2023 You will notice that the beginning of the motion feels completely natural. To get an idea how this works, close your eyes and try to take a drink of water from a glass. The inner loop uses a much faster control scheme, proprioception, to get the body moving and approaching the target as fast as possible. This tries to get the advantages of both worlds. An outer loop that uses the (slower) visual feedback to correct any errors in the inner loop.An inner loop that gets our proprioception to get to our estimate of the target as soon as possible.We’re going to set up our control scheme with: But what if we pretend to be pre-Kepler astronomers and solve all of our problems by adding more loops? Loops within Loops Generating the correction factor is just as much work as figuring out where to move the arm in the first place. If the proprioceptive loop doesn’t do what you want when you ask, why not ask it to do something different? You know that friend you have that is always late, so you lie and tell them to show up earlier than you actually want them to? We have the brain do that to our body. (Note that for our purpose, it isn’t important to differentiate overshoot from undershoot.) Loop #2 The proprioceptive loop thinks everything is hunky-dory. Didn’t have a good enough proprioceptive feedback to know that you aren’t in the correct position.īoth of these have the same effect: the point isn’t online where you want it.Miscalculated the position you have to rotate your shoulder to.Your muscles spring to action and try to meet the task.īut what happens if you didn’t end up bringing the point online perfectly? You made one of these two possible mistakes: Now we are running a closed loop control, with X as the target. The more you train, the better an estimate for X your brain can solve for! You want to move the point online, and your brain figures out where you need to rotate your shoulder to get there. The first loop we get to talk about is the proprioception of the muscles. But we have to hold up our end of the bargain and make sure the point is in the exact right place when they hit it. Since we aren’t actually thrusting I guess that means that they’re just kind of impaling themselves on our sword. Let’s imagine that we just need to rotate our arm up, about the shoulder, to get the point exactly online. In reality, our actions require some fancy coordination, creating movement in some joints while simultaneously activating stabilization muscles to keep the unneeded joints in place. Closed Loop Control Makes Fencing Good and Cars Cozy – Understanding of what closed loop control is, and how it applies to fencing.įor simplicity’s sake, we’ll look at the action of a single joint.How Many Senses Do You Have? – Examination of the sense of proprioception, and the relative speed (much faster) in relation to vision.It will be extremely helpful if you have read the two prior articles in this mini series: So how does it all get put together, the faster proprioception and the slower sight? Others might be able to transcend such limitations The amount of information we can take in from strictly visual stimuli is immense and irreplaceable. Which is good, because the non-vision senses tend to be much faster.īut as fast as the other senses are, they’re no substitute for sight. This sense of touch, along with other senses such as proprioception, give us a lot of feedback on top of what our vision provides. The concept of touch in sword fighting appears in almost every system.
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