This link has been bookmarked by 31 people . It was first bookmarked on 04 May 2008, by Dave Duarte.
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14 Mar 15
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person's preferred hand is not a clear indication of the location of brain function. Although 95% of right-handed people have left-hemisphere dominance for language, 18.8% of left-handed people have right-hemisphere dominance for language function. Additionally, 19.8% of the left-handed have bilateral language functions.[8] Even within various language functions (e.g., semantics, syntax, prosody), degree (and even hemisphere) of dominance may differ.[9]
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27 Feb 15
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28 Jul 13
Dante-Gabryell Monson"Broad generalizations are often made in popular psychology about one side or the other having characteristic labels, such as "logical" for the left side or "creative" for the right. These labels need to be treated carefully; although a lateral dominance is measurable, both hemispheres contribute to both kinds of processes,[1] and experimental evidence provides little support for correlating the structural differences between the sides with such broadly-defined functional differences."
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22 Mar 12
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While functions are lateralized, these are only a tendency. The trend across many individuals may also vary significantly as to how any specific function is implemented.
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reas of exploration of this causal or effectual difference
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dendritic structure
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gross anatomy
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neurotransmitter distribution
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lateralization is evident in the phenomena of right- or left-handedness and of right or left ear preference, but a person's preferred hand is not a clear indication of the location of brain function
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One of the first indications of brain function lateralization resulted from the research of French physician
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Broca, in 1861.
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eft frontal lobe brain area (Broca's area) is an important speech production region
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syphilitic lesion in the left cerebral hemisphere
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Wernicke c
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ontinued in the vein of Broca's research by studying language defic
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some were linguistic
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not every deficit was in speech production
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caused language comprehension deficits rather than speech production deficits, a syndrome known as Wernicke's aphasia.
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(PET) are important because of their high spatial resolution and ability to image subcortical brain structures.
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here are ways of determining hemispheric dominance in a person. The Wada Test i
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ased neurosurgeon Wilder Penfield and his neurologist colleague Herbert Jasper developed a technique of brain mapping to help reduce side effects caused by surgery to treat epilepsy.
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1940s, American born
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stimulated motor and somatosensory cortices of the brain with small electrical currents to activate discrete brain regions
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y found that stimulation of one hemisphere's motor cortex produces muscle contraction on the opposite side of the body.
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the functional map of the motor and sensory cortices is fairly consistent from person to person
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on split-brain patien
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e 1960
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greater understanding of functional laterality
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hese connections are cut, the two halves of the brain have a reduced capacity to communicate with each other
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right hemisphere was capable of rudimentary language processing, but often has no lexical or grammatical abilitie
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right hemisphere having at least some syntactic ability.
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anguage production is left-lateralized in up to 90% of right-handed subjects, it is more bilateral,
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right hem
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vidence[22] that the right hemisphere is more involved in processing novel situations, while the left hemisphere is most involved when routine or well rehearsed processing is called for.
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15 Mar 12
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20 Feb 12
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A longitudinal fissure separates the human brain into two distinct cerebral hemispheres, connected by the corpus callosum. The sides resemble each other and each hemisphere's structure is generally mirrored by the other side. Yet despite the strong anatomical similarities, the functions of each cortical hemisphere are managed differently. For example, the lateral sulcus generally is longer in the left hemisphere than in the right hemisphere.
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Broad generalizations are often made in popular psychology about one side or the other having characteristic labels such as "logical" or "creative". These labels need to be treated carefully; although a lateral dominance is measurable, these characteristics are in fact existent in both sides,[1] and experimental evidence provides little support for correlating the structural differences between the sides with functional differences.[2]
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10 Feb 12
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28 Apr 11
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Broad generalizations are often made in popular psychology about certain functions (e.g. logic, creativity) being lateralized, that is, located in the right or left side of the brain. These ideas need to be treated carefully because the popular lateralizations are often distributed across both side
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Brain function lateralization is evident in the phenomena of right- or left-handedness and of right or left ear preference, but a person's preferred hand is not a clear indication of the location of brain function. Although 95% of right-handed people have left-hemisphere dominance for language, only 18.8% of left-handed people have right-hemisphere dominance for language function. Additionally, 19.8% of the left-handed have bilateral language functions.[5] Even within various language functions (e.g., semantics, syntax, prosody), degree (and even hemisphere) of dominance may differ.[6]
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grammar and vocabulary
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lateralized to the left hemisphere
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often
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prosodic language functions,
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lateralized to the right hemisphere
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visual and audiological stimuli
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processing of
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artistic ability
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seem to be functions of the right hemisphere
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spatial manipulation
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Depression is linked with a hyperactive right hemisphere, with evidence of selective involvement in "processing negative emotions, pessimistic thoughts and unconstructive thinking styles", as well as vigilance, arousal and self-reflection, and a relatively hypoactive left hemisphere, "specifically involved in processing pleasurable experiences" and "relatively more involved in decision-making processes".
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right hemisphere is more involved in processing novel situations
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left hemisphere is most involved when routine or well rehearsed processing is called for.
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31 Jan 11
meerasinghbrain
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10 Sep 10
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25 Mar 10
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28 Nov 09
Carlos MestrePopular psychology tends to make broad and sometimes pseudoscientific generalizations about certain functions (e.g. logic, creativity) being lateral, that is, located in either the right or the left side of the brain. Researchers often criticize popular p
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22 Feb 09
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29 Aug 08
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08 Aug 08
evgeny yauhenioA longitudinal fissure separates the human brain into two distinct cerebral hemispheres, connected by the corpus callosum. The sides resemble each other and each hemisphere's structure is generally mirrored by the other side. Yet despite the strong similarities, the functions of each cortical hemisphere are different.
Popular psychology tends to make broad and sometimes pseudoscientific generalizations about certain functions (e.g. logic, creativity) being lateral, that is, located in either the right or the left side of the brain. Researchers often criticize popular psychology for this, because the popular lateralizations often are distributed across both hemispheres, [1] although mental processing is divided between them.
Fundamental to brain process lateralization is the fact that the lateral sulcus generally is longer in the left hemisphere than in the right hemisphere. The extent of specialized brain function by area remains under investigation. If a specific region of the brain is either injured or destroyed, its functions can sometimes be recovered by a neighboring region, even in the opposite hemisphere, depending upon the area damaged and the patient's age.
Broca's Area and Wernicke’s Area are linked by a white matter fiber tract, the arcuate fasciculus. This axonal tract allows the neurons in the two areas to work together in creating vocal language. In more than 95 per cent of right-handed men, and more than 90 per cent of right-handed women, language and speech are subserved by the brain's left hemisphere. In left-handed people, the incidence of left-hemisphere language dominance is 73 per cent [8] or 61%[2], depending on the studies.
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Specificity of language deficits: Damage to the brain produces language
deficits in specific ways that seem to correspond to two very specific
areas of the brain where the ability to speak seems to be located. -
04 May 08
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Left brain functions Right brain functions sequential simultaneous analytical holistic verbal imagistic logical intuitive linear algorithmic processing holistic algorithmic processing mathematics: perception of counting/measurement mathematics: perception of shapes/motions[citation needed] present and past present and future[citation needed] language: grammar/vocabulary, literal language: intonation/accentuation, prosody, pragmatic, contextual
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09 Sep 07
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