A researcher behind a study of wasabi's effect on cognition says he knew the fiery condiment had health benefits, but "the dramatic change" in memory was a surprise.
For those unaware, the vast majority of 'Wasabi' around the world is really just horseradish paste. The actual Wasabi plant is much rarer and harder to cultivate/mass produce. Real Wasabi also loses it's flavor in about 15 minutes.
This study appears to be referring to the actual Wasabi plant, so the spicy green paste you eat on your sushi isn't going to be boosting your memory like in this study.
Kinda suspicious that it's a Japanese study saying this. Kinda how I would be suspicious if an Italian study said authentic Parmesan cheese cured cancer, or a Scottish study said that 12 year old single malt whisky increased life expectancy.
Not always, was talking to my family about the difference in a local sushi restaurant in the Midwest and the chef brought out some for us to try. It was a great experience.