A change from alpha wave drowsiness to lower frequency theta brain waves signify early sleep.

从α波睡意到较低频率的脑电波的变化表示早睡。

" d" theta, which I like to think of as signaling the fact that some kind of limit is being taken.

“d”theta，我喜欢将其视为表明 正在采取某种限制的事实。

There are three frequencies that we need to understand, Beta frequency, Theta frequency, and Alpha frequency.

我们需要理解三种频率，贝塔频率，西塔频率和阿尔法频率。

If you were to measure this angle right over here, you would get theta.

这里已知斜面同水平面的夹角是θ 未来的视频中 我们会明确这个角为30度 45度等等。

So the factor by which the slice gets squished down in this direction is exactly cosine of theta.

因此，切片 在这个方向上被压扁的因正是 theta 的余弦。

And that's why it's cosine of theta.

因此 两者相等。

Remember, the mass ratio of our blocks determines this angle theta in the analogy.

记住，我们的块的质量比决定了这个类比中的角度θ。

Theta waves occur if the brain is awake but relaxed, on autopilot or daydreaming.

Theta波在大脑清醒但、于自动导航状态或白日梦时出现。

Theta state is what children are usually in as far as their brainwaves go.

θ脑波状态是孩子们的大脑波通常所的状态。

Theta waves, which is the next brain we're talking about.

接下来我们要讨论的是Theta波，这是我们提到的下一个“脑”。

So you can get in there in a theta state, which is a state, which is a trance state, which is a state that you can connect to the quantum yourself itself, if you believe in that.

所以你以进入 theta 状态，这是一种恍惚状态，如果你相信的话，你以通过这种状态与量子自我本身连接。

Theta brainwaves are associated with daydreaming and rapid eye movement ( REM) dreaming phase of sleep, Theta brainwaves occur when you are in a state like driving on the freeway or are running for a long time.

Theta 脑电波与白日梦和睡眠的快速眼动 （REM） 梦境阶段有关，Theta 脑电波发生在您于在高速公路上驾驶或长时间行驶等状态时。

Finally, as you move into REM sleep, your brain is as busy as it was during the day, firing theta waves with burst of alpha and beta.

最后，当您进入 REM 睡眠时，您的大脑会像白天一样忙碌， 发射带有 alpha 和 beta 爆发的 theta 波。

Yeah, that happens because we're trying to make that the that voiced dental fricative, the theta, which how do you pronounce that in UK English theta?

是的，这是因为我们试图发出那个浊齿擦音 θ（theta）。在英式英语中，θ 该怎么发音呢？

And ds is in the same direction as the magnetic field, so the angle theta equals zero degrees, and the cosine of zero degrees equals 1.

并且 ds 与磁场所指方向相同，所以角度 θ 等于 0 度，而 0 度的余弦值等于 1。

And when you get into theta, which is the ultimate state, where if you're a writer, you can write without any writer's block.

当你进入 theta 状态时， 也就是终极状态，如果你是作家， 就能毫无阻碍地写作。

But what we don't understand is why people like me can go from beta to alpha theta within seconds involuntarily.

但我们不明白的是，为什么像我这样的人能在几秒钟内不由自主地从贝塔状态进入阿尔法和西塔状态。

Theta is the angle between the magnetic field and each point on the loop.

Theta是磁场之间的角度 以及循环上的每个点。

So that means my influence on getting a particular data point doesn't depend on any other data point that I've already collected, given knowledge of theta.

因此， 这意味着我对获取特定数据点的影响不取决于我已经收集的任何其他数据点，因为我知道 theta。

But for rotational motion, we really want to know the object’s angle -- what we call theta.

但是对于旋转运动， 我们真的想知道物体的角度——我们称之为 theta。