If we take this equation over here, let me just give myselfĪ little bit of space. That's because the background intensity in a quiet room versus a concert is different, and so the delta I, which is whether you're just whispering or whether you're yelling, is different in accordance But if you're at a rock concert, you have to be yellingĪt the top of your lungs in order for someone You can talk really, really softly and the person can hear you. Stimuli like lifting a weight but it also works for auditory stimuli. This part of the equation over here is known as the Weber fraction. The incremental threshold is relatively constant, and that constant is this K value. There is this particular threshold, and the ratio, the background intensity to K is a constant forĮach individual person. More or less fairly constant for a bunch of different weights. 5 divided by five, this ratio is actually equal, and it equals. 2 divided by two, and if we were to take. Weber noticed in 1834 that the ratio of the increment threshold, the ratio of the increment threshold, which is this over here, to the background intensity, which is this over here, so this is the background intensity, is constant. Basically, there is actuallyĪ guy back in the day named Weber. 5, and then in the two-pound example, I would be two, and delta I would be. For the five-pound example, I would be five, and delta I would be. It would be 5.5 pounds minus five pounds equals half a pound. And delta I, so delta I, would be the just noticeable difference. I, or the intensity of the stimulus, is equal to two pounds in this case and five pounds in this case. In the five-pound weight category, the just noticeableĭifference is. This experimentally, the actual numbers might be different, but the concept generally

Just throwing around, and if you actually did Is a little bit higher than when you're holding two pounds. Holding five pounds, let's say for sake of argument, the just noticeable difference Noticeable difference in order to actually be mentally aware of the change in weight. Basically, what's going on here is that since you're using more muscle fibers, you're using more sensory neurons, they're not as sensitive Half a pound increase, but you might not notice The five-pound weight with a 5-1/2-pound weight, so 5.5-pound weight, and I asked you to lift it, you might notice the In this case, if I replace the five-pound weight with a 5.2-pound weight, because it's a lot heavier and you're using a lot more muscle fibers in order to lift the five-pound weight, you may not notice the. The five-pound weight is much heavier than the two-pound weight. Let's imagine that instead of starting with a two-pound weight, instead, we started withĪ five-pound weight, so five-pound weight. Noticeable difference, let's say for just sake of argument, is. Noticeable difference, noticeable difference. You go from not noticing a tiny little change to actually noticing a tiny little change is known as the just You're able to notice an increase or a change in weight or really any sensation so that threshold, where Probably wouldn't get noticed, whereas an addition of 0.2 Basically, what I'm trying to say is that a addition of. Notice this new increase, this new weight. This new 2.2-pound weight, and then I ask you to lift the new weight. Weight out of your hand, and I replaced it with

Giving you a 2.05-pound weight let's say that I gave you a weight that was 2.2 pounds, and let's say you close your eyes and I took this two-pound Increase in the weight, for most people probably, would not be noticeable. Basically, what I'm trying to say is that this. Let's say that I asked you to lift this new 2.05-pound weight, and you might lift it, and you may notice that it's different, but most people in general would not notice any difference. Let's say that we replaced this guy with the 2.05-pound weight. I've got this 2.05-pound weight, and it's the same exact Weight out of your hand and I replaced it with another weight that was 2.05 pounds. Let's say that we took this weight and you didn't know, let's say I grabbed the As you lift this two-pound weight, you notice that there is some resistance, and you definitely are able to notice that there is a weight in your hand. Holding it in your hand and you want to lift it up. We've got your arm here, and you got these nice big strong muscles, and you're holding in your hand a weight.

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