There are many theories on how the brain learns, including variations of backpropagation. We don&#x27;t really know anything. Here&#x27;s a relatively recent theory by Hinton: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=kxp7eWZa-2M&amp;feature=youtu.be&amp;t=38m13s" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=kxp7eWZa-2M&amp;feature=youtu.be...</a><p>Regardless, this has nothing to do with how the brain learns, but rather the function it has learned. Even if a neural network somehow used entirely local learning rules, it could still be exploited with this method.