Final answer:
Dopamine is the neurotransmitter that would be expected in high quantities in the brain of someone who has worked hard.
Step-by-step explanation:
The neurotransmitter that you would expect to see in high quantities in the brain of someone who has worked hard is dopamine. Dopamine is associated with motivation, reward, and pleasure, and it is often released when we engage in activities that are considered rewarding or pleasurable, such as achieving a goal or completing a challenging task. So, when someone has put in a lot of effort and hard work, their brain would likely have increased levels of dopamine.
Learn more about neurotransmitters