A force can increase or decrease the speed of an object, and it can change the direction of motion.

力可以增加或降低物体的速度，并且可以改变运动的方向。

The high IQ subjects spotted the direction of motion much faster than those with low IQ. Which is not a surprise.

高智商的受试者辨认出移动方向的速度比低智商的受试者更快。这并不让人感到吃惊。

And any forces opposite the direction of motion we're gonna call negative.

任何与运动方向相反的力我们都称为负力。

It tells us it's sensitive to the presence of motion but not the direction of motion.

它告诉我们它对运动的存在敏感，但对运动的方向不敏感。

This five kilogram mass is accelerating downward, and this force is in the opposite direction of motion.

这个 5 千克的质量块正在向下加速，这个力的方向与运动方向相反。

But does that tell us that neurons in human MT are specific for the direction of motion?

但这是否告诉我们，人类 MT 中的神经元对于运动方向具有特定性？

Everybody's moving in different directions, everybody's looking in different directions, but they're all looking 45 degrees to the direction of motion.

每个人都在朝不同的方向移动， 每个人都在朝不同的方向看，但他们的视线都与运动方向呈 45 度角。

All right, so all of that tells us just that there are neurons someplace in your brain that are sensitive to the direction of motion.

好吧，所有这些都告诉我们，大脑中的某个地方有一些神经元对运动方向敏感。

That means you can also inject an electrical signal in a little patch of MT and give the monkey a net percept of a direction of motion.

这意味着您还可以在一小块 MT 中注入电信号，让猴子对运动方向有一个净感知。

If all the neurons were scrambled around spatially, so that there was no clustering of neurons sensitive to, say, this direction of motion, then stimulation wouldn't do anything.

如果所有的神经元在空间上都乱七八糟，这样就没有对这个运动方向敏感的神经元聚集，那么刺激就不会产生任何作用。

And so the whole point of this is a way with behavior to ask the question of whether you have neurons in your brain tuned to specific directions of motion.

因此，这一切的重点是用行为来询问你的大脑中是否有神经元适应特定的运动方向。