A research participant is asked to recall one at a time a list of 20 words he has just been asked to learn. When he recalls more words from the beginning than the middle of the list, it is called the effect and is MOST likely due to recall from memory.

primacy, long-term memory    

Explanation:

A research participant is asked to recall one at a time a list of 20 words he has just been asked to learn. When he recalls more words from the beginning than the middle of the list, it is called the primacy effect and is MOST likely due to recall from long-term memory.

Primacy effect is an evidence of long-term memory storage, It is a phenomenon that occurs when individuals tend to remember/recall the earlier items on a list instead of the most recent items, this is because the earlier/first items on the list are rehearsed more than the most recent and as such are stored in the long-term memory. Why on the contrary, there may not be sufficient time to rehearse the recent items on the list, hence they are stored in the short-term memory.

its d i know cause i've been googling it

answer; biological;