Humans are aware of no more than a millionth of all the information that our brains process. The conscious mind is capable of processing somewhere between 16 and 40 bits of information (ones and zeroes) per second, whereas the unconscious can handle more than 11 million bits per second. This limited awareness diminishes the credibility of the verbatim we all observe in market research and other settings.
Researchers at Columbia University Medical Center did a study that validates this very concept. While study participants were looking at a monitor, researchers displayed an image of a fearful facial expression onto the monitor for only milliseconds, immediately followed by a similar neutral facial expression. The fearful face appeared and disappeared so quickly that the subjects had no conscious awareness of it. Each participant was interviewed and each of them denied seeing the image.
Functional magnetic resonance imaging (fMRI) scans of these same participants showed significant and isolated activity in the basolateral subregion of the amygdala at the time the image appeared on the monitor, proving a response to the stimuli. (Etkin et al, 2004.) Facial Action Coding at the time of exposure could validate the precise emotion felt by each participant.
Spoken word will rarely align with actual emotions or subconscious activity due to the way the conscious mind works.