Lateralization of brain function

Short description: Specialization of some cognitive functions in one side of the brain

The human brain is divided into two hemispheres-left and right. Scientists continue to explore how some cognitive functions tend to be dominated by one side or the other; that is, how they are lateralized.

Right cerebral hemisphere

Left cerebral hemisphere

The lateralization of brain function (or hemispheric dominance[1][2]/ latralisation[3][4]) is the tendency for some neural functions or cognitive processes to be specialized to one side of the brain or the other. The median longitudinal fissure separates the human brain into two distinct cerebral hemispheres, connected by the corpus callosum. Although the macrostructure of the two hemispheres appears to be almost identical, different composition of neuronal networks allows for specialized function that is different in each hemisphere.

Lateralization of brain structures is based on general trends expressed in healthy patients; however, there are numerous counterexamples to each generalization. Each human's brain develops differently, leading to unique lateralization in individuals. This is different from specialization, as lateralization refers only to the function of one structure divided between two hemispheres. Specialization is much easier to observe as a trend, since it has a stronger anthropological history.[5]

The best example of an established lateralization is that of Broca's and Wernicke's areas, where both are often found exclusively on the left hemisphere. Function lateralization, such as semantics, intonation, accentuation, and prosody, has since been called into question and largely been found to have a neuronal basis in both hemispheres.[6] Another example is that each hemisphere in the brain tends to represent one side of the body. In the cerebellum, this is the same body side, but in the forebrain this is predominantly the contralateral side.

## Contents

* 1 Lateralized functions
* 1.1 Language
* 1.2 Sensory processing
* 1.3 Value systems
* 2 Clinical significance
* 2.1 Hemisphere damage
* 2.2 Plasticity
* 2.3 Broca's aphasia
* 2.4 Wernicke's aphasia
* 3 Society and culture
* 3.1 Possible misapplication
* 3.2 Popular psychology
* 3.3 Sex differences
* 4 History
* 4.1 Broca
* 4.2 Wernicke
* 4.3 Imaging
* 4.4 Movement and sensation
* 4.5 Split-brain patients
* 5 Additional images
* 6 See also
* 7 References
* 8 External links
* 9 Bibliography
* 10 Further resources

## Lateralized functions

### Language

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]

This photo shows the left and right specialties of the brain.

Broca's area and Wernicke's area, associated with the production of speech and comprehension of speech, respectively, are located in the left cerebral hemisphere for about 95% of right-handers but about 70% of left-handers.[9]: 69 Social interactions, demonstrating fierce emotions, and mathematical information are all provided by the right hemisphere.[10]

### Sensory processing

The processing of basic sensory information is lateralized by being divided into left and right sides of the body or the space around the body.

In vision, about half the neurons of the optic nerve from each eye cross to project to the opposite hemisphere, and about half do not cross to project to the hemisphere on the same side.[11] This means that the left side of the visual field is processed largely by the visual cortex of the right hemisphere and vice versa for the right side of the visual field.

In hearing, about 90% of the neurons of the auditory nerve from one ear cross to project to the auditory cortex of the opposite hemisphere.

In the sense of touch, most of the neurons from the skin cross to project to the somatosensory cortex of the opposite hemisphere.

Because of this functional division of the left and right sides of the body and of the space that surrounds it, the processing of information in the sensory cortices is essentially identical. That is, the processing of visual and auditory stimuli, spatial manipulation, facial perception, and artistic ability are represented bilaterally.[8] Numerical estimation, comparison and online calculation depend on bilateral parietal regions[12][13] while exact calculation and fact retrieval are associated with left parietal regions, perhaps due to their ties to linguistic processing.[12][13]

### Value systems

Rather than just being a series of places where different brain modules occur, there are running similarities in the kind of function seen in each side, for instance how right-side impairment of drawing ability making patients draw the parts of the subject matter with wholly incoherent relationships, or where the kind of left-side damage seen in language impairment not damaging the patient's ability to catch the significance of intonation in speech.[14] This has led British psychiatrist Iain McGilchrist to view the two hemispheres as having different value systems, where the left hemisphere tends to reduce complex matters such as ethics to rules and measures, and the right hemisphere is disposed to the holistic and metaphorical.[15]

## Clinical significance

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".[16] Additionally, "left hemisphere lesions result in an omissive response bias or error pattern whereas right hemisphere lesions result in a commissive response bias or error pattern."[17] The delusional misidentification syndromes, reduplicative paramnesia and Capgras delusion are also often the result of right hemisphere lesions.[18]

Lateral view of the Brain

### Hemisphere damage

Damage to either the right or left hemisphere, and its resulting deficits provide insight into the function of the damaged area. There is truth to the idea that some brain functions reside more on one side of the brain than the other. We know this in part from what is lost when a stroke affects a particular part of the brain. Left hemisphere damage has many effects on language production and perception. Damage or lesions to the right hemisphere can result in a lack of emotional prosody[19] or intonation when speaking.[20] The left hemisphere is often involved with dealing of detail oriented and perception while the right hemisphere is involved with mostly overview and an overall concept of things.[1]

Right hemisphere damage also has grave effects on understanding discourse. People with damage to the right hemisphere have a reduced ability to generate inferences, comprehend and produce main concepts, and a reduced ability to manage alternative meanings. Furthermore, people with right hemisphere damage often exhibit discourse that is abrupt and perfunctory or verbose and excessive. They can also have pragmatic deficits in situations of turn taking, topic maintenance and shared knowledge. .[20] Although both sides of the hemisphere has different responsibilities and tasks, they both complete each other and create a bigger picture. [2] Lateral brain damage can also affect visual perceptual spatial resolution. People with left hemisphere damage may have impaired perception of high resolution, or detailed, aspects of an image. People with right hemisphere damage may have impaired perception of low resolution, or big picture, aspects of an image.

### Plasticity

If a specific region of the brain, or even an entire hemisphere, is injured or destroyed, its functions can sometimes be assumed by a neighboring region in the same hemisphere or the corresponding region in the other hemisphere, depending upon the area damaged and the patient's age.[21] When injury interferes with pathways from one area to another, alternative (indirect) connections may develop to communicate information with detached areas, despite the inefficiencies.

### Broca's aphasia

Broca's aphasia is a specific type of expressive aphasia and is so named due to the aphasia that results from damage or lesions to the Broca's area of the brain, that exists most commonly in the left inferior frontal hemisphere. Thus, the aphasia that develops from the lack of functioning of the Broca's area is an expressive and non-fluent aphasia. It is called 'non-fluent' due to the issues that arise because Broca's area is critical for language pronunciation and production. The area controls some motor aspects of speech production and articulation of thoughts to words and as such lesions to the area result in specific non-fluent aphasia.[22]

### Wernicke's aphasia

Wernicke's aphasia is the result of damage to the area of the brain that is commonly in the left hemisphere above the Sylvian fissure. Damage to this area causes primarily a deficit in language comprehension. While the ability to speak fluently with normal melodic intonation is spared, the language produced by a person with Wernicke's aphasia is riddled with semantic errors and may sound nonsensical to the listener. Wernicke's aphasia is characterized by phonemic paraphasias, neologism or jargon. Another characteristic of a person with Wernicke's aphasia is that they are unconcerned by the mistakes that they are making.

## Society and culture

### Possible misapplication

Oversimplification of hemisphericity

The concept of "right-brained" or "left-brained" individuals is considered a widespread myth which oversimplifies the true nature of the brain's cerebral hemispheres (for a recent counter position, though, see below). Proof leading to the "mythbuster" of the left-/right-brained concept is increasing as more and more studies are brought to light. Harvard Health Publishing includes a study from the University of Utah in 2013, that exhibited brain scans revealing similarity on both sides of the brain, personality and environmental factors aside.[1] Although certain functions show a degree of lateralization in the brain—with language predominantly processed in the left hemisphere, and spatial and nonverbal reasoning in the right—these functions are not exclusively tied to one hemisphere.[23]

Terence Hines states that the research on brain lateralization is valid as a research program, though commercial promoters have applied it to promote subjects and products far outside the implications of the research.[24] For example, the implications of the research have no bearing on psychological interventions such as eye movement desensitization and reprocessing (EMDR) and neurolinguistic programming,[25][26] brain-training equipment, or management training.[27]

Counter position

The debate as to being “right-brained” or “left-brained” has recently been reopened anew.[28] This re-opening is based on relatively recent neuroscience which has refined the underlying primary functions of the two sides of the neocortex. In particular, Elkhonon Goldberg's “novelty-routinization” theory posits that the neocortex's right and left hemispheres primarily process cognitively novel and cognitively routine tasks, respectively.[29]

(Thus, this theory fits with [novel] aspects of visual-spatial processing predominantly occurring in the right hemisphere, as they tend to be relatively novel; similarly, [familiar] aspects of language tend to being predominantly processed in the left hemisphere, as they indeed tend to be cognitively routine to us. New/novel aspects of language, though, will fittingly be processed in the right-brain, just as familiar aspects of visual-spatial processing will be processed in the left-brain. [This explains why these functions are not exclusively tied to one hemisphere.])

As such, right-brained people favor the cognitively novel tasks/information whereas left-brained people favor the cognitively routine tasks/information. Or, in other words, right-brained people tend to prefer new and novel experiences whereas left-brained people favor familiar experiences. (Thus, this theory is the deeper understanding of many of pop psychology's “oversimplifications” of lateralization. For example, it explains why the right hemisphere has been considered creative, as creativity tends to involve new and novel information/tasks, whereas the left hemisphere has been considered analytical, as analysis tends to be the re-processing of already familiar information.)

This is not to say, though, that the tendencies of the left hemisphere cannot be performed well by a right-brained person and vice versa. For instance, right-brained people can exhibit strong analytical skills and attention to detail (generally cognitively routine, left-brained tasks), sometimes even surpassing their left-brained counterparts, but their overall tendency is more so to instead be synthesizing and to attend to the big picture (generally cognitively new, right-hemisphere-tending tasks). (Such nuances are one reason this thinking has been labeled a myth.)

Based on Goldberg's theory, the following table provides newly identified preferences of left- and right-brained people.[28]

Preference Category | Left-brained People | Right-brained People

|
|

Experience Type | Familiar and Existing  | New and Novel
Learning/Action Pattern | Learn, then Do  | Do, then Learn
Improve or Create? | Improve  | Create
Review or Discover? | Review  | Discover
Depth or Breadth? | Depth  | Breadth
Analyze or Action? | Analyze  | Action

It is vital, though, to remember that these are only tendencies. At times we may contradict our tendency to be left- or right-brained, but often we can come to identify the underlying reason.[28] Furthermore, although less likely, some of us may be more bilobal, but in general it seems most of demonstrate tendencies related to one side or the other—in other words, most of us prefer either new and novel experiences most of the time or we prefer familiar and known experiences most of the time.

This is not to say, though, that we do not use the whole brain. Life and personal growth require the use and development of both the right and left hemispheres, as it requires the processing of novel, unfamiliar situations as well as familiar, routine ones. Without this ability, we would struggle to survive and thrive. Interestingly, as we get older, we tend to become more set in our ways, which fits with many older adults and seniors having struggles to stay up on technology and other new and novel experiences.

### Popular psychology

Further information: Popular psychology

The oversimplification of lateralization in pop psychology. This belief was widely held even in the scientific community for some years.

Some popularizations oversimplify the science about lateralization, by presenting the functional differences between hemispheres as being more absolute than is actually the case.[30]: 107 [31] Interestingly, research has shown quite opposite function of brain lateralisation, i.e. left hemisphere creatively and chaotically links between concepts and right hemisphere tends to adhere to specific date and time, although generally adhering to the pattern of left-brain as linguistic interpretation and right brain as spatio-temporal.[32][33][34]

### Sex differences

In the 19th century and to a lesser extent the 20th, it was thought that each side of the brain was associated with a specific gender: the left corresponding with masculinity and the right with femininity and each half could function independently.[35] The right side of the brain was seen as the inferior and thought to be prominent in women, savages, children, criminals, and the insane. A prime example of this in fictional literature can be seen in Robert Louis Stevenson's Strange Case of Dr. Jekyll and Mr. Hyde.[36]

## History

### Broca

One of the first indications of brain function lateralization resulted from the research of French physician Pierre Paul Broca, in 1861. His research involved the male patient nicknamed "Tan", who had a speech deficit (aphasia); "tan" was one of the few words he could articulate, hence his nickname. In Tan's autopsy, Broca determined he had a syphilitic lesion in the left cerebral hemisphere. This left frontal lobe brain area (Broca's area) is an important speech production region. The motor aspects of speech production deficits caused by damage to Broca's area are known as expressive aphasia. In clinical assessment of this type of aphasia, patients have difficulty producing speech.[37]

### Wernicke

German physician Karl Wernicke continued in the vein of Broca's research by studying language deficits unlike expressive aphasia. Wernicke noted that not every deficit was in speech production; some were linguistic. He found that damage to the left posterior, superior temporal gyrus (Wernicke's area) caused language comprehension deficits rather than speech production deficits, a syndrome known as receptive aphasia.

### Imaging

These seminal works on hemispheric specialization were done on patients or postmortem brains, raising questions about the potential impact of pathology on the research findings. New methods permit the in vivo comparison of the hemispheres in healthy subjects. Particularly, magnetic resonance imaging (MRI) and positron emission tomography (PET) are important because of their high spatial resolution and ability to image subcortical brain structures.

### Movement and sensation

In the 1940s, 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. They stimulated motor and somatosensory cortices of the brain with small electrical currents to activate discrete brain regions. They found that stimulation of one hemisphere's motor cortex produces muscle contraction on the opposite side of the body. Furthermore, the functional map of the motor and sensory cortices is fairly consistent from person to person; Penfield and Jasper's famous pictures of the motor and sensory homunculi were the result.

### Split-brain patients

Main article: Philosophy:Split-brain

Research by Michael Gazzaniga and Roger Wolcott Sperry in the 1960s on split-brain patients led to an even greater understanding of functional laterality. Split-brain patients are patients who have undergone corpus callosotomy (usually as a treatment for severe epilepsy), a severing of a large part of the corpus callosum. The corpus callosum connects the two hemispheres of the brain and allows them to communicate. When these connections are cut, the two halves of the brain have a reduced capacity to communicate with each other. This led to many interesting behavioral phenomena that allowed Gazzaniga and Sperry to study the contributions of each hemisphere to various cognitive and perceptual processes. One of their main findings was that the right hemisphere was capable of rudimentary language processing, but often has no lexical or grammatical abilities.[38] Eran Zaidel also studied such patients and found some evidence for the right hemisphere having at least some syntactic ability.[citation needed]

Language is primarily localized in the left hemisphere. While the left hemisphere has proven to be more optimized for language, the right hemisphere has the capacity with emotions, such as sarcasm, that can express prosody in sentences when speaking. According to Sheppard and Hillis, "The right hemisphere is critical for perceiving sarcasm (Davis et al., 2016), integrating context required for understanding metaphor, inference, and humour, as well as recognizing and expressing affective or emotional prosody—changes in pitch, rhythm, rate, and loudness that convey emotions".[39] One of the experiments carried out by Gazzaniga involved a split-brain male patient sitting in front of a computer screen while having words and images presented on either side of the screen, and the visual stimuli would go to either the right or left visual field, and thus the left or right brain, respectively. It was observed that if the patient was presented with an image to his left visual field (right brain), he would report not seeing anything. If he was able to feel around for certain objects, he could accurately pick out the correct object, despite not having the ability to verbalize what he saw.

## Additional images

* Ventricles of brain and basal ganglia. Superior view. Horizontal section. Deep dissection

* Ventricles of brain and basal ganglia. Superior view. Horizontal section. Deep dissection

## See also

* Alien hand syndrome
* Ambidexterity
* Bicameral mentality
* Brain asymmetry
* Chirality
* Contralateral brain
* Cross-dominance
* Divided consciousness
* Dual consciousness
* Emotional lateralization
* Handedness
* Hemispherectomy
* Laterality
* Left brain interpreter
* The Master and His Emissary
* Parallel computing
* Psychoneuroimmunology
* Right hemisphere brain damage
* Of Two Minds (book)
* Wada test
* Yakovlevian torque

[40]

## References

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2. ↑ "Hemispheric differences and hemispheric dominance (video)" (in en). https://www.khanacademy.org/test-prep/mcat/behavior/biological-basis-of-behavior-ner/v/hemispheric-differences-and-hemispheric-dominance.
3. ↑ "Localisation of Function in the brain and Hemispheric Lateralisation: motor, somatosensory, visual, auditory and language centres; Broca's and Wernicke's areas, split brain research. Plasticity and Functional Recovery of the brain after trauma" (in en-gb). https://www.psychologyhub.co.uk/student-resources/paper-2-biopsychology/brain-localisation-and-hemispheric-lateralisation/.
4. ↑ "Lateralization of Brain Function - Simply Psychology". https://www.simplypsychology.org/brain-lateralization.html.
5. ↑ "Lateralization of the vertebrate brain: taking the side of model systems". The Journal of Neuroscience 25 (45): 10351–10357. November 2005. doi:10.1523/JNEUROSCI.3439-05.2005. PMID 16280571.
6. ↑ "Choosing words: left hemisphere, right hemisphere, or both? Perspective on the lateralization of word retrieval". Annals of the New York Academy of Sciences 1369 (1): 111–131. April 2016. doi:10.1111/nyas.12993. PMID 26766393. Bibcode: 2016NYASA1369..111R.
7. ↑ Psycholinguistics: Learning and using Language. Pearson. 1990. ISBN 978-0-13-733817-7. p. 367
8. ↑ 8.0 8.1 "Chapter 7". Introduction to Neuropsychology (Second ed.). The Guilford Press. 2008. ISBN 978-1-59385-068-5.
9. ↑ Psychology : a concise introduction (3rd ed.). New York, NY: Worth Publishers. 2012. ISBN 978-1429261555.
10. ↑ Rogers, Lesley J. (July 2021). "Brain Lateralization and Cognitive Capacity" (in en). Animals 11 (7): 1996. doi:10.3390/ani11071996. ISSN 2076-2615. PMID 34359124.
11. ↑ "The Optic Nerve - Human Anatomy". Photius Coutsoukis. https://theodora.com/anatomy/the_optic_nerve.html.
12. ↑ 12.0 12.1 "Sources of mathematical thinking: behavioral and brain-imaging evidence". Science 284 (5416): 970–974. May 1999. doi:10.1126/science.284.5416.970. PMID 10320379. Bibcode: 1999Sci...284..970D. http://www.unicog.org/publications/DehaeneSpelke_ExactApprox_Science1999.pdf.
13. ↑ 13.0 13.1 "Three parietal circuits for number processing". Cognitive Neuropsychology 20 (3): 487–506. May 2003. doi:10.1080/02643290244000239. PMID 20957581. http://www.unicog.org/publications/DehaeneEtAl_3parietalCircuits_CogNeuropsy2003.pdf.
14. ↑ McGilchrist (2009) provides an extensive survey of the relevant literature in chapter two.
15. ↑ "One Head, Two Brains: How The Brain's Hemispheres Shape The World We See" (in en) (Audio podcast with transcript). 4 Feb 2019. https://www.npr.org/templates/transcript/transcript.php?storyId=690656459.
16. ↑ "Depression and the hyperactive right-hemisphere". Neuroscience Research 68 (2): 77–87. October 2010. doi:10.1016/j.neures.2010.06.013. PMID 20603163.
17. ↑ "Post unilateral lesion response biases modulate memory: crossed double dissociation of hemispheric specialisations". Laterality 14 (2): 122–164. March 2009. doi:10.1080/13576500802328613. PMID 18991140.
18. ↑ "Delusional misidentifications and duplications: right brain lesions, left brain delusions". Neurology 72 (1): 80–87. January 2009. doi:10.1212/01.wnl.0000338625.47892.74. PMID 19122035.
19. ↑ Patel, Sona; Oishi, Kenichi; Wright, Amy; Sutherland-Foggio, Harry; Saxena, Sadhvi; Sheppard, Shannon M.; Hillis, Argye E. (2018). "Right Hemisphere Regions Critical for Expression of Emotion Through Prosody". Frontiers in Neurology 9: 224. doi:10.3389/fneur.2018.00224. ISSN 1664-2295. PMID 29681885.
20. ↑ 20.0 20.1 Zickert, Nele; Geuze, Reint H.; Beking, Tess; Groothuis, Ton G. G. (2021-08-20). "Testing the Darwinian function of lateralization. Does separation of workload between brain hemispheres increase cognitive performance?". Neuropsychologia 159: 107884. doi:10.1016/j.neuropsychologia.2021.107884. ISSN 0028-3932. PMID 34090868.
21. ↑ "The cognitive outcome of hemispherectomy in 71 children". Epilepsia 45 (3): 243–254. March 2004. doi:10.1111/j.0013-9580.2004.15303.x. PMID 15009226.
22. ↑ Biopsychology (8th ed.). Allyn & Bacon. 2011. ISBN 978-0-205-83256-9.
23. ↑ This article incorporates text available under the CC BY 4.0 license. Betts, J Gordon; Desaix, Peter; Johnson, Eddie; Johnson, Jody E; Korol, Oksana; Kruse, Dean; Poe, Brandon; Wise, James et al. (June 8, 2023). Anatomy & Physiology. Houston: OpenStax CNX. 13.2 The Central Nervous System. ISBN 978-1-947172-04-3.
24. ↑ "Left Brain/Right Brain Mythology and Implications for Management and Training". The Academy of Management Review 12 (4): 600–606. 1987. doi:10.2307/258066.
25. ↑ "Growing anti-intellectualism in Europe; a menace to science". Studia Psychologica 45 (1): 5–13. 2003. , available in ALLEA Annual Report 2003 , pp. 61–72
26. ↑ "An evaluation of the left-brain vs. right-brain hypothesis with resting state functional connectivity magnetic resonance imaging". PLOS ONE 8 (8): e71275. 2013-08-14. doi:10.1371/journal.pone.0071275. PMID 23967180. Bibcode: 2013PLoSO...871275N.
27. ↑ Mind Myths: Exploring Popular Assumptions about the Mind and Brain. New York: Wiley. 1999. ISBN 978-0-471-98303-3. https://books.google.com/books?id=ldd9AAAAMAAJ.
28. ↑ 28.0 28.1 28.2 Schroeder, Thomas (15 July 2023). "Left-Brain, Right-Brain Reconceptualized: A New Neuroscientific Understanding of an Old Divide". https://medium.com/p/436858d6762e.
29. ↑ "A New Look at the Old Riddle: Novelty, Routines and the Evolution of the Bicameral Brain.". Japanese Journal of Cognitive Neuroscience 20 (3–4): 129–138. 2018.
30. ↑ Psychology : Australian and New Zealand edition. Milton, Qld.: John Wiley & Sons. 2006. ISBN 9780470805527.
31. ↑ "Mapping brain asymmetry". Nature Reviews. Neuroscience 4 (1): 37–48. January 2003. doi:10.1038/nrn1009. PMID 12511860.
32. ↑ "Cognitive psychology - Brain Right hemisphere is random and left hemisphere is linear? Really?". Stack Exchange, Inc. https://psychology.stackexchange.com/questions/16096/brain-right-hemisphere-is-random-and-left-hemisphere-is-linear-really.
33. ↑ "Cerebral specialization and interhemispheric communication: does the corpus callosum enable the human condition?". Brain: A Journal of Neurology 123 ( Pt 7) (7): 1293–326. July 2000. doi:10.1093/brain/123.7.1293. PMID 10869045.
34. ↑ "Schematic drawing showing how the left hemisphere differs from the right in mnemonic functions.". https://academic.oup.com/view-large/figure/5559555/b071316.gif. "The left is specialized for semantic processing while the right appears to be specialized for episodic memory."
35. ↑ (in en) Medicine, Mind, and the Double Brain: A Study in Nineteenth-Century Thought. Princeton University Press. 1989-01-01. pp. 87–90. ISBN 978-0691024226. https://books.google.com/books?id=y4YMSE9HUEMC.
36. ↑ "Robert Louis Stevenson's "Jekyll and Hyde" and the Double Brain". SEL: Studies in English Literature 1500–1900 46 (4): 879–900. 2006. doi:10.1353/sel.2006.0043.
37. ↑ "Sur le siège de la faculté du langage articulé". Bulletins et Mémoires de la Société d'Anthropologie de Paris 6 (1): 377–393. 1865. doi:10.3406/bmsap.1865.9495. https://www.persee.fr/doc/bmsap_0301-8644_1865_num_6_1_9495.
38. ↑ Kandel E, Schwartz J, Jessel T. Principles of Neural Science. 4th ed. p1182. New York: McGraw-Hill; 2000. ISBN 0-8385-7701-6
39. ↑ "That's right! Language comprehension beyond the left hemisphere". Brain: A Journal of Neurology 141 (12): 3280–3289. December 2018. doi:10.1093/brain/awy291. PMID 30496360.
40. ↑ Shmerling, Robert (25 August 2017). "Right brain/left brain, right?". Harvard Medical School. https://www.health.harvard.edu/blog/right-brainleft-brain-right-2017082512222.

## External links

* Left Brain, Right Brain? Wrong

## Bibliography

* The Master and His Emissary: The Divided Brain and the Making of the Western World (Hardcover ed.). US: Yale University Press. 9 October 2009. ISBN 978-0-300-14878-7.

* Güntürkün, Onur; Ocklenburg, Sebastian (16 October 2017). The Lateralized Brain: The Neuroscience and Evolution of Hemispheric Asymmetries (Hardcover ed.). Academic Press. ISBN 9780128034538.

## Further resources

* "Hemispheric specialization for language". Brain Research. Brain Research Reviews 44 (1): 1–12. January 2004. doi:10.1016/j.brainresrev.2003.10.001. PMID 14739000.
* A Critique of Psychopathology. Parodos Verlag. 2012. ISBN 978-3-938880-51-7.
* The Right Mind: Making Sense of the Hemispheres. Harcourt Brace International. 1998. ISBN 978-0-15-600627-9.
* Jill Bolte Taylor (2008). My Stroke of Insight. Viking: USA. 0670020745.

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Laterality

Side  | Left  | Both  | Right
General |  | Ambidexterity |
In cognitive abilities | Geschwind–Galaburda hypothesis
In brain |

* Brain asymmetry
* Dual brain theory
* Bicameralism

In eyes | Ocular dominance
In hands | Left-handedness | Cross-dominance | Right-handedness
Handedness in boxing | Southpaw stance |  | Orthodox stance
Handedness in people | Musicians |  |
Handedness related to |

* Sexual orientation
* Maths

Handedness measurement | Edinburgh Handedness Inventory
Handedness genetics | LRRTM1
In heart | Levocardia |  | Dextrocardia
In major viscera | Situs solitus | Situs ambiguus | Situs inversus
In feet | Footedness
Footedness in surfing | Regular foot |  | Goofy foot

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