A general process in which the presentation of a stimulus leads to an increased response to a later stimulus is termed:

Sensitization

Explanation:

Sensitization: In psychology, the term "sensitization" is determined as one of the "non-associative" learning processes through which a stimulus gets the repeated or continuous exposure that often results into the "progressive amplification" or increase in strength of the reaction to a specific stimulus. Thus, the organism becomes more sensitive to that particular stimulus as time goes by.

In the question above, the given statement signifies sensitization.

is there a year set? the question is incomplete

answer; delirium is a common adverse reaction seen when elderly patients take diphenhydramine;