Answer:
Occam's Razor
Step-by-step explanation:
"Mozart Effect" was first used by Alfred A. Tomatis, who used to listen to Mozart's music and found positive outcomes to the cure of many disorders. It is believed that listening to such music will improve the performance of young kids when doing mental tasks.
Occam's Razor is the philosophical or analytical principle which is used to decide the credibility of statements. In simple words, the lesser assumption needed to prove a phenomenon, the more accurate is the phenomenon.
Hence the explanation that the investigators explored about "Mozart Effect" demonstrates the principle of Occam's Razor
Thus the answer is "Occam's Razor".