SubscribeThe language centers in the left hemisphere of humans actually make the left hemisphere bulge out slightly in comparison to the same areas of the right hemisphere. This is easily seen without the aid of the microscope. For this reason, some neurolinguists have called humans the lopsided ape. Some paleontologists claim to have found evidence for this left-hemispheric bulging in Homo neanderthalus and Homo erectus skulls.
Other primates also possess a left perisylvian area of the brain, but it doesn't seem to be involved in their communication. Animal communication seems in fact to be controlled by the subcortical areas of the animal brain, much like human vocalizations other than language--laughter, sobbing, crying, as well as involuntary, word-like exclamations which do form part of language--are controlled in humans in the subcortex, a phylogenetically older portion of the brain that is involved with emotions and reflex responses.
Tourette's syndrome, which produces random and involuntary emotive reflex responses, including vocalizations This type of disorder, which often affects language use, is caused by a disfunction in the subcortex. There is no filter which prevents the slightest stimulus from producing a vocal response, sometimes of an inappropriate manner using abusive language or expletives. These words are involuntary and often the affected individual is not even aware of uttering them (like "um" in many individuals) and only realizes it when video is played back.
This syndrome is not so much a language disorder per se as a disorder of the filters on the adult emotional reflex system--a kind of expletive hiccup. True language is housed in the cortex of the left hemisphere, not in the subcortical area that controls involuntary responses.
Again, you have heard that it has been said to the ancients: you shall not swear falsely, but you shall make good your oaths to the Lord. I tell you not to swear at all: not by heaven, because it is the throne of God; not by the earth, because it is the footstool for his feet; not by Jerusalem, because it is the city of the great king; not by your own head, because you cannot make one hair of it white or black. Let your speech be yes yes, no no; more than that comes from the evil one.That's Matthew 5, somewhere in the 30s; my Bible is a bit unclear about the exact verse numbers.
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posted by creasy boy at 1:34 AM on October 28, 2007