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 Bar Bar Bar Bar Bar Bar what do you hear if you heard Bar Bar Bar you'd be right but how about now Bar Bar Bar Bar Bar Bar ch 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 Bar Bar Bar 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 this is a perfect example of something called the mcer 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 the 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 trone 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 [Laughter] tune and yet if I play the exact 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 shepher 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 varing effect on our minds which we discuss in our new ASAP thought 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 so do you still trust your ears got a burning question you want answered ask it in the comments or on Facebook and Twitter and if you want the inside scoop on upcoming episode ideas and behind the scenes check out our personal Instagram and Twitter handles and subscribe for more weekly science videos