Jonghyun is able to play "go fish," a card game that requires quick thinking. what brain change most directly supports his ability to think quickly?

Myelination.

Explanation:

Brain acts as one of the most important organ of the body that helps in receiving the stimuli and interpret the information in the form of signal. Two main types of neuron are myelinated neuron and unmyelinated neuron.

The myelinated neuron increases the conductivity of the impulse. The myelinated neurons are much more active than the unmyelinated neuron. In case of the quick thinking and instant actions, the myelinated neurons play an important role.

Thus, the answer is myelination.

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