Many of us have become quick to catch illusions that trick our eyes, but how often do you consider illusions of the ear? Are you really able to trust your ears and the things they hear?
For example, listen to Greg speaking. What do you hear? If you heard "bar, bar, bar," you'd be right. But, how about now? Chances are you heard "far, far, far" this time, with an "f"—except, you didn't. In fact, the audio didn't even change between the two videos. Strange as it may seem, what you hear depends on which video you're looking at. Go ahead. Take turns watching each video and see how the sound morphs.
舉例來說，聽聽 Greg 說話。你聽到什麼？如果你聽到 bar、bar、bar，你就對了。不過，現在呢？這次你可能聽到 far、far、far，有 f－－只不過，你並沒有聽到。事實上，這兩段影片的聲音根本沒有變。這或許看似奇怪，但你聽見什麼聲音卻取決你看的是哪段影片。去試試。輪流看兩段影片然後觀察聲音會怎樣變化。
This is a perfect example of something called the McGurk effect, which shows how our visuals can alter what we believe we're hearing.
Now I want you to count how many times you see a circle flash on screen. Let's do that one more time. Did you see it flash twice? Many people do. Yet, without the sound, it becomes clear that the circle is only flashing once. In this case, the sound has altered your perceived vision.
The next one works best with other people around. I'll play two tones, and you tell me if they're ascending or descending. In other words, are the notes played from low to high or high to low? Listen to this. Which was it? How about this one? Write down what you heard for each number and let us know in the comments. Chances are if you compare with enough people, you'll all have different answers. Surprising? Try some more! And this one.
How is it possible that you're hearing something different from others? It's an auditory illusion called the tritone paradox. It's created in such a way that the tones contain both a higher and lower frequency in them, but our brains have a preference of which to listen to. Diana Deutsch, the creator of this illusion, found that your geography and language from infancy all play a role in deciding this preference.
Finally, listen to this audio clip of a gradually climbing tune. And yet, if I play exact the same clip back to you, it will sound like it's only continuing to climb higher and higher. I swear this is the exact same clip I just played. You can rewind that section of this video over and over and check for yourself. Try it! Each time you start it over, the tune is seemingly climbing even higher.
It's called the Shepard tone illusion, of which there are many variations. In it, multiple sine waves are played on top of one another, raising in pitch, while one quickly drops down an octave as the others continue rising. But our brain doesn't notice this drop, and so the clips sound like they're rising forever.
These illusions may help to explain how something like music can have such a profound yet varying effect on our minds, which we discuss in our new AsapTHOUGHT episode here, along with the question of whether or not music can save your life. There's a link in the description to watch it.
這些錯覺可能有助解釋為什麼像音樂這種東西可以對我們的大腦有如此深遠卻不同的影響，我們會在這裡的全新 AsapTHOUGHT 單元中討論，還有音樂能不能拯救生命的這個問題。在資訊欄中有個連結可以收看。
So, do you still trust your ears?
- 「例如、舉例來說」- For Example
For example, listen to Greg speaking.
舉例來說，聽聽 Greg 說話。
- 「事實上、實際上」- In Fact
In fact, the audio didn't even change between the two videos.
- 「取決於、視...而定」- Depend On
Strange as it may seem, what you hear depends on which video you're looking at.
- 「輪流」- Take Turns
Take turns watching each video and see how the sound morphs.
- 「換句話說、換言之」- In Other Words
In other words, are the notes played from low to high or high to low?
- 「很有可能」- Chances Are
Chances are if you compare with enough people, you'll all have different answers.