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Language functions such as grammar, vocabulary and literal meaning are typically lateralized to the left hemisphere, especially in right-handed individuals. [7] While language production is left-lateralized in up to 90% of right-handers, it is more bilateral, or even right-lateralized, in approximately 50% of left-handers. [8]
For example, a stroke affecting the right parietal lobe of the brain can lead to neglect for the left side of the visual field, causing a patient with neglect to behave as if the left side of sensory space is nonexistent (although they can still turn left). In an extreme case, a patient with neglect might fail to eat the food on the left half ...
For example, when something is placed on the left hand of a blindfolded patient with the two hemispheres disconnected, the left hand can pick the correct object within a set of objects but the right hand cannot. [6] Audition – Though most of the input from one ear would go through the same ear, the opposite ear also receives some input ...
The reasons for this are not fully understood, but it is thought that because the left cerebral hemisphere of the brain controls the right side of the body, the right side is generally stronger; it is suggested that the left cerebral hemisphere is dominant over the right in most humans because in 90–92% of all humans, the left hemisphere is ...
A person can show one or more of these symptoms during a stroke. Decreased consciousness is more uncommon than in stroke due to intracerebral hemorrhage, but may be present when there is infarctions in more than one part of the brain or in the brain stem. [13] Symptoms of cerebral infarction can help determine which parts of the brain are affected.
The laterality of the sensory inputs makes a difference insofar as left-sided inputs directed to the intact left hemisphere are not affected by extinction, or affected to a much smaller degree than left-sided inputs directed to the damaged right hemisphere. In other words, the lateral organization of sensory inputs is an important factor in the ...
The left hemisphere is usually responsible for performing language functions, although left-handed individuals have been shown to perform language functions using either their left or right hemisphere depending on the individual. The anterior frontal lobes of the language-dominant hemisphere are essential for initiating and maintaining speech. [1]
It is traditionally thought to reside in Brodmann area 22, located in the superior temporal gyrus in the dominant cerebral hemisphere, which is the left hemisphere in about 95% of right-handed individuals and 70% of left-handed individuals. [1] Damage caused to Wernicke's area results in receptive, fluent aphasia. This means that the person ...
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