Intelligence is a Whole-Brain Phenomenon, New Meta-Analysis SuggestsTechnology
Previous research has indicated that general cognitive ability, or IQ, is mostly related to specific areas of grey matter in the brain, including temporal, parietal and frontal regions. A new meta-analysis published in The American Journal of Psychiatry, however, shows that intelligence is actually a much more distributed phenomenon.
In the study, an international team of more than 40 neuroscientists used an MRI technique called diffusion tensor imaging (DTI), as well as IQ tests, to study whether small variations in the neural wiring systems of 1,717 test subjects (957 healthy participants and 760 patients with schizophrenia) could account for differences in IQ.
Given recent findings showing that patients with schizophrenia tend to have widespread abnormalities in the microstructure of white matter in the brain, the aim of the study was to determine whether changes in white matter have anything to do with general cognitive ability.