Do you know, when you see someone yawn, you too end up yawing within matter of seconds or may be less than couple of minutes, this is because of mirror neurons existing in your brain. Keeping this in in view let me mention the following, there is a neurological syndrome called mirror touch synesthesia, in this the mind is hard wired to perceive a aspect which occurs to the opposite person as there own, here even the emotional reactions of the adjacent person is mimicked in the effected person and they again perceive it's as there own, in this its the micro facial expressions which imposes its roll drastically.
Alright, now let me talk to you about the topic at hand, aphasia is an impairment of language, affecting the production or comprehension of speech and the ability to read or write, there are three types of aphasics, sensory, motor and global.
People who can’t understand words are better at picking up lies about emotions.
Studies have shown that, people with aphasia proved to be naturals at spotting emotion-based lies, with a success rate of better than normal ones. Aphasia results from damage to the brain’s left hemisphere, which makes it difficult to understand or produce language. But while damage to the left hemisphere may sharpen lie detection skills, damage to the right could dull them. Parts of the right brain, and the anterior cingulate gyrus, which spans both hemispheres, allow us to know our own thoughts and intuit others’ intentions. Without a fully functioning right brain, people can’t deceive—or detect deception.
In short, as people with aphasia have lost the ability to comprehend spoken language, to compensate that, many aphasics become highly sensitive to certain minor inflections in speech, when normal people lie, those vocal neurons become pronounced, which normal ones wouldn't notice, but aphasics do.