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== IQ testing ==
Traditional [[Intelligence quotient|IQ tests]] observe the test-taker's performance in a standardized battery of samples of behavior. The resulting IQ standard score is the subject of much investigation as psychologists check correlations between IQ and other life outcomes. The [[Wechsler Adult Intelligence Scale|Wechsler]] IQ tests for adults and for children have long been regarded as the "gold standard" in IQ testing.<ref name="WechslerGold" />
[[File:Functional magnetic resonance imaging.jpg|thumbnail|fMRI data showing regions of activation]]
== Neural bases of intelligence ==
The varying techniques of imaging-based testing search for different signs of intelligence. The types of intelligence analyzed in this review were [[fluid intelligence]] (Gf), [[general intelligence]] (g), and [[crystallized intelligence]] (Gc). Early studies utilized information from patients with brain damage, noticing changes in intelligence scores that correlated to certain regions of the brain. As imaging technology has improved, so has the ability for deeper neuro-analysis. MRI studies have found that the volume of gray matter correlates to intelligence, providing evidence for generalizations made regarding brain/head-size and intelligence. Additionally, PET and fMRI studies have revealed more information regarding the functionality of certain regions of the brain.
By recording and interpreting the brain activity of subjects as they complete a variety of tasks, researchers are able to draw connections between the types of task (and thus, the type of intelligence) that calls on particular areas of the brain. Knowing how parts of the brain are utilized may reveal more information about the structure and hierarchy used in neural development. It also may provide interesting information regarding the pathways of neural signals as they navigate the nervous system. Image-based testing may allow researchers to discover why certain neurons are connected, if they are indeed aligned in a purposeful manner and consequently, how to repair such pathways when they are damaged.<ref>{{cite journal | last1 = Gray | first1 = J. R. | last2 = Thompson | first2 = P. M. | year = 2004 | title = Neurobiology of intelligence: science and ethics | journal = Nature Reviews. Neuroscience | volume = 5 | issue = 6| pages = 471–82 | doi = 10.1038/nrn1405 | pmid=15152197| s2cid = 2430677 }}</ref> In general, there have been two types of intelligence studies: psychometric and biological. Biological approaches make use of neuroimaging techniques and examine brain function. Psychometrics focuses on mental abilities. Ian Deary and associates suggest that a greater overlap of these techniques will reveal new findings.<ref name=deary1>{{cite journal|last=Deary|first=Ian J.|author2=Austin, Elizabeth J. |author3=Caryl, Peter G. |title=Testing versus understanding human intelligence.|journal=Psychology, Public Policy, and Law|date=1 January 2000|volume=6|issue=1|pages=180–190|doi=10.1037/1076-8971.6.1.180}}</ref>
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===Neural conduction speed===
[[nerve conduction study|Nerve conduction velocity]] (NCV) has been studied, giving varying results. Some have hypothesized that "higher intelligence is associated with better 'neural efficiency.'" A few studies suggested an association between nerve conduction velocity and scores on the Multidimensional Aptitude Battery (MAB). However, other studies have challenged these claims, finding little correlation between nerve conduction velocity and reaction time (RT).<ref name=deary2 />
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== Ethical implications ==
[[Privacy]] and [[confidentiality]] are major concerns for neuroimaging studies. With high-resolution anatomical images, such as those generated by [[fMRI]], it is possible to identify individual subjects, putting their personal
It is becoming more accepted that a neurobiological basis for intelligence exists (at least for reasoning and problem-solving). The success of these intelligence studies present ethical issues. A large concern for the general population is the issue of [[race and intelligence]]. While little variation has been found between racial groups, the public perception of intelligence studies has been negatively impacted by concerns of [[racism]]. It is important to consider the consequences of studies that investigate intelligence differences in population-groups (racial or ethnic) and if it is ethical to conduct these studies. A study suggesting that one group is biologically more intelligent than another may cause tension. This has made neuroscientists reluctant to investigate individual or group differences in intelligence, as they may be perceived as racist.<ref>{{cite journal|last=Gray|first=Jeremy R.|author2=Thompson, Paul M.|title=Neurobiology of intelligence: science and ethics|journal=Nature Reviews Neuroscience|date=1 June 2004|volume=5|issue=6|pages=471–482|doi=10.1038/nrn1405|pmid=15152197|s2cid=2430677 }}</ref>
==See also==
*[[Evolution of human intelligence]]
*[[Neuroscience and intelligence]]
==References==
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[[Category:Intelligence tests|*]]
[[Category:Neuroimaging]]
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