Broca's and Wernicke Areas of
the Brain, and Their Function on Speech
If you have ever wondered
what part of the brain that controls speech, it's called Broca's Area. The
Broca's ares is located in the left frontal lobe and controls not only speech production
but also language comprehension, language compression and controls facial
neurons.
Pierre Paul Brocca
discovered the Broca's area in 1861 after studying the brain of a deceased
patient who had suffered from speech impairment. Found in the frontal lobe in
the inferior frontal gyrus, the Broca's area is comprised of the Pars
triangularis and the Pars opercularis.
Carl Wernicke discovered the
Wernicke's area of the brain around 10 years later after the Broca's area had
been discovered. Wernicke was the first to note that not all speech related
deficits were due to the Broca's area.
The Broca's area is
connected by the arcuate fasciculus (pathway made of neurons) to the Wernicke's
area. At the front portion of the Broca's area the Pars triangularis is
located; this is where the verbal conducts are programmed in the brain. At the
back region of the Broca's area the Pars opercularis is located is also
considered a part of speech, in which language is produced. Due to the Pars
opercularis location (near areas that are related to motor skills) it is fully
known if there is a full connection to language production.
Damage to Broca's
Area
Damage to Broca's
area is called Broca's asphasia. A person suffering damage will likely exhibit
problems like words not coming out properly formed, slowed or slurred speech,
prevention of producing words, and possibility of not being able to comprehend
language.
Damage to Wernicke's
area
Damage to the
Wernicke's area known as Wenicke's aphasia would result in people suffering
from the loss of ability to comprehend language, and also the ability to speak
words clearly but the inability to properly put them together. The words
someone would speak would be out of order and would make no sense.
Speech-related brain
disorders can range from but not limited to strokes, traumatic brain injury,
aphasia, brain tumors, brain infections, degeneration defects and disrupted
blood flow to the brain. Depending on the extent of the disorder and damage
speech can be impaired on different levels. Depending on the disorder and
treatment available speech damage may be able to be repaired through speech
therapists and ongoing treatment of the disorder.
The brain
has two big tasks related to speech: making it and understanding it.
Psychologists and others who study the brain have debated whether these are
really two separate tasks or whether they both use the same regions of the
brain. Now, a new study, published in the August issue of Psychological
Science, a journal of the Association for Psychological Science, finds that
speaking and understanding speech share the same parts of the brain, with one
difference: we don't need the brain regions that control the movements of lips,
teeth, and so on to understand speech.
Useful info!
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