Studies suggest that there is a intelligence and the neural processing speed in the brain.
to learn whether intelligence is related to information-processing capacities, researchers have tested participants to determine how long it takes them to perceive briefly presented visual images.
the speed with which people retrieve information from memory has been found to be a predictor of their verbal intelligence.
example:
precocious 12 to 14 year-old college students with unusually high levels of verbal intelligence are most likely to retrieve information from memory at an unusually rapid speed.