Word-08-17

Word-08-17 - Brain and Language November 6, 2008 The...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Brain and Language November 6, 2008
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The cerebral hemispheres are divided into a right hemisphere and a left hemisphere. Each hemisphere is specialized for some behaviors. The hemispheres communicate with each other through a thick band of 200-250 million nerve fibers, called the corpus callosum . Language Math Logic Spatial abilities Face recognition Visual imagery
Background image of page 2
Left hemisphere corpus callosum corpus callosum
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The right side of the brain controls muscles on the left side of the body and the left side of the brain controls muscles on the right side of the body. Brain damage to one side of the brain will affect the opposite side of the body. Sensory information from the left side of the body crosses over to the right side of the brain and information from the right side of the body crosses over to the left side of the brain through the corpus callosum .
Background image of page 4
Left brain Posterior brain Right brain Superior brain Inferior brain
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
In 95% of right-handers, the left side of the brain is dominant for language. Even in 60-70% of left-handers, the left side of brain is used for language. Back in the 1860s and 1870s, Paul Broca and Karl Wernicke observed that when people had damage to a particular area on the left side of the brain, they had speech and language problems, but people with damage to these specific areas on the right side usually did not have any language problems. The two language areas of the brain that are important for language now bear their names: Broca's area and Wernicke's area .
Background image of page 6
Much of what we know about the  functions of the brain we know from  Split-Brain experiments Sometimes, a surgical procedure is used to split the corpus callosum : this surgical operation isolates most of the right hemisphere from the left hemisphere. This type of surgery is performed in patients suffering from epilepsy, to prevent the spread of the "epileptic seizure" from one hemisphere to the other. After surgery, these people appear quite "normal" - they walk, read, talk, play sports and perform all everyday activities they performed before surgery. Only after careful experiments that isolated information from reaching one hemisphere, could the real effects of the surgery be determined.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Some Experimental Techniques: Selective hemispheric input: Because each half of the visual field projects to the opposite site of the brain, it is possible to project a picture to either the right hemisphere OR the left hemisphere.
Background image of page 8
So, say a "typical" (language in the  LEFT  hemisphere)  split-brain patient  is looking 
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 23

Word-08-17 - Brain and Language November 6, 2008 The...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online