Musical capacity and Coordination and bodily control capacity. Language capacity and spatial capacity 3. One refers to general problem solving ability and other to acquired knowledge. Fluid intelligence refers to the rapidly changing knowledge base that is modified and built over the life span. Fluid intelligence is related to general problem solving capacity.
Crystallized intelligence is knowledge based and is particularly affected by our experience in life.
A component of the EEG record called the P100 was shown to have a good fit to IQ scores. Slow P100s are associated with higher IQ scores. Fast P100s are associated with higher IQ scores. The correlation between 'brain speed' and intelligence scores shows that a major component of intelligence is speed of neural processing. The concept of IQ began historically as an expression of the relation between chronological age and mental age.