> "Whether nasal, as opposed to mouth, breathing can improve people’s long-term memories unrelated to odors — or otherwise enhance cognition — is still in doubt

> "Whether nasal, as opposed to mouth, breathing can improve people’s long-term memories unrelated to odors — or otherwise enhance cognition — is still in doubt" It seems an odd choice to use scent here (if they intended any generalization), since there is direct influence in scent from breathing through mouth or nose. Even having something plugging your nose (even if you breathed through your mouth normally) I imagine could influence your memory temporarily. Psychology experiments are hard.