It has been believed for some time that certain functions, e.g. language, logical thinking, creative thinking, are associated with connections in specific hemispheres of the brain and that individuals preferentially employ one hemisphere over the other. A recent imaging study has confirmed that specific functions are associated with connections in one hemisphere or the other but has not verified that individuals are preferentially “left-brained” or “right-brained”:
The scientists conducted the brain measurements using magnetic resonance imaging (MRI) analysis, which involved the participants lying in the scanner for 5 to 10 minutes while their “resting” brain measurements were taken. This allowed the researchers to correlate brain activity in one area of the brain and compare it with another.
The researchers then divided the brain into 7,000 regions and analyzed which regions of the brain showed more functional lateralization.
All connections in the brain were examined, and all possible combinations of the brain regions were correlated for each brain region that was left-lateralized or right-lateralized.
The results of the scan showed patterns indicating that a brain connection may be strongly left or right-lateralized. But they found no relationship that individuals “preferentially” used their left-brain network or right-brain more often.