The correct answer to this open question is the following.
In one study of reading and math ability in third- and fifth-grade children, the researchers found that high-scoring children usually had three sources of cognitive stimulation. Media was not a source of cognitive stimulation.
Scientist highly recommend mental stimulation for children to develop the part in their brains that work on language and cognition. Children must have activities that improve alternating attention, that foments inhibition, and that improve their semantic memory.