These "studies" are just ways to generate clickbait headlines and nothing else. They always use the "accessible" death metal songs with simple structures like Morbid Angel's "God of Emptiness", Decapitated "Spheres of Madness" or Cannibal Corpse's "Hammer Smashed Face" to do these tests, as if they think the genre is a novelty.
These "studies" are just ways to generate clickbait headlines and nothing else. They always use the "accessible" death metal songs with simple structures like Morbid Angel's "God of Emptiness", Decapitated "Spheres of Madness" or Cannibal Corpse's "Hammer Smashed Face" to do these tests, as if they think the genre is a novelty.