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"[New research] is suggesting that atypical brain function is a fundamental aspect of speech production tasks for adults who stutter. ... "Now because many speech areas are interconnected across the two hemispheres through the corpus callosum, it might suggest that hemispheric dominance for speech and language has not been established to the same degree as it has been for normally fluent adults." ... Loucks then used functional magnetic resonance imaging of brain activity to study participants who stutter and found that even brief, simple speech tasks - such as producing a single word to name a picture - is associated with altered functional activity."

Stuttering, with its characteristic disruption in verbal fluency, has been known for centuries; earliest descriptions probably date back to the Biblical Moses' "slowness of speech and tongue" and his related avoidance behavior (Exodus 4, 10-13). Stuttering occurs in all cultures and ethnic groups ( Andrews et al. 1983; Zimmermann et al.

Recently someone mentioned on If you believe, as I do, that stuttering is fundamentally the result of stress/tension-sensitive muscles of the vocal folds (also known as vocal cords) that "lock" when over-tensed, it makes sense that cold weather could make stuttering worse.

If you're looking for the species that most closely matches our linguistic prowess, surprisingly, you won't find it in the apes, the primates, or even in the mammals. You have to travel to a far more distant relative, all the way to a family of birds known as the songbirds. The vocal life of a songbird is similar to ours in many ways. They learn songs by imitating their elders. Like human speech, these songs are passed down from one generation to the next. Songbirds are also best equipped to learn songs in their youth, and they have to practice to develop their ability. They can improvise and string together riffs into new songs, and over generations these modified songs can turn into new dialects. And like us, they come hard-wired with 'speech-centers' in their brain that are dedicated to language processing. An experiment from 2009 by Fehér and colleagues took newly hatched songbirds of the zebra finch species and raised them in sound proof chambers. They did this during their critical period of language development. Surprisingly, this culturally isolated generation of birds began to develop their own songs. These songs were less musical than your typical songbird song - they had irregular rhythms, they would stutter their notes, and the notes would sound more noisy. But the researchers were curious where this would lead. They listened to the songs of the next few generations of pupils, the offspring of these children of silence. What they found was quite amazing. In just two generations, the songs started to change in unexpected ways - they were becoming more musical. In fact, they started to converge upon the song of the wild songbirds, even though none of these birds had ever heard the wild songs. The Feher study suggests, but does not prove, that songbirds must have an innate understanding of the structures of their language. In other words, they seem to have a built-in intuition about grammar. Over time, they may be using these intuitions to develo