It’s a pretty well-known fact at this stage that when you are deprived of one sense the others compensate and become much more receptive so you get a picture of whats around you! Pretty basic stuff right and the Blind tasting works in a pretty similar fashion… except of being deprived of sight (despite what the name says) you are actually being deprived of any pre conceived notions about the wine.
If I may for a moment- the power of suggestion is a pretty powerful thing… as we all very well know, but when it comes to wine there are so many factors that can affect a persons impression of a wine- price, region, variety, winemaker etc. So the only way to safe guard against all of this is to remove them. Experiments back this up- Frédéric Brochet gave two samples of the same wine to a group of people only one bottle was labeled cheap table wine and the other with a grand cru thing! Guess what the results were- yes even though it was the same wine the claimed the more expensive was by far and a way much better! Now this isn’t all that conclusive… but what is really interesting is when he gave people a white wine he got the usual white wine description fresh, dry, honeyed, lively… but after dying it red he got a totally different description intense, spicy, supple, deep… so you see the power of suggestion is a pretty powerful thing!
So you see why they’re important- in fact to qualify for Italy’s DOCG classification you have to pass a blind tasting! Which is pretty intense!