but current studies are begainning to place greater emphasis on the conditions under which we forget.

想问一下,这个under which 怎么样理解?

under which we forget. which指代先行词conditions, under these conditions we forget. 这这类条件下大家会忘事。全句表达的意思为:目前研究的重点是哪些条件致使大家会忘事。