The study in which 6-year-old children were presented with a 5-day training program designed to improve effortful attention demonstrated that...

The study in which 6-year-old children were presented with a 5-day training program designed to improve effortful attention demonstrated that experience can:

improve intelligence test scores but not brain processes.

change brain processes but not intelligence test scores.

improve both intelligence test scores and brain processes.

change neither intelligence test scores nor brain processes.