American scientists found that the convolution angular left is vital in this process. Most of people understand that the proverb The grass is always more green of the other side has a deeper and more general meaning that the one that suggests the sentence in yes.

But people that has lesions in a small area of the bark cerebral called convolution angular left take this sentence literally. Investigators from the United States found that an area of the size of a nut located for above and behind the left hearing it is necessary to understand the deep meaning behind the proverbs and the metaphors.

The investigators studied four patients that have lesions or defects in the convolution angular left as a result of an attack cerebrovascular or a tumor, but that beyond that they are normal. They asked them them to explain the deep meanings of twenty proverbs and metaphors. The patients took most of the sentences literally, there where other three patients with cerebral lesions in other areas interpreted it correctly.