Answer:
Neuroscientific methods; structural.
Step-by-step explanation:
'Neuroscience' is described as the branch of science that is associated with observing and examining the very composition and function of the human brain as well as the nervous system. The neuroscientific methods aim to study how the human brain and its workings lead to a significant impact on human behavior, thinking, and cognitive functions. Advancement in 'neuroscientific methods' allow us to appropriately examine the test environments under which the age-associated 'structural' development in the brain is affiliated with reduction and enhancement in functioning or operation of the brain.