I can't see how anyone could view these results of proof that people can successfully identify differenes in wood tone. A group of monkeys would be just as likely to guess correctly 14%.
Wow. Hold up a moment. Maybe 14% of monkeys would have chosen #3. But using that logic, wouldn't way more than 2% of monkeys choose #4? Wouldn't way fewer than 47% of monkeys choose #2?
I'm not saying your test wasn't interesting, and that deception isn't a valid technique, BUT, you need to apply it carefully and
factor it in when analyzing the results. You did so much tedious work in constructing the physical conditions of the test, but clearly you need to leave the analysis of the results up to other people.
Like me. I'll do the tedious part for you here. Just remember, I didn't make this complex, you did.
Realize that people given multiple choice tend to choose only from answers that fit the preconditions stated in the test. So it shouldn't come as a shock that many people would rule-out options 3, 4 & 5. Despite the fact that people should have only used their ears, you cannot suddenly discount your preconditioning deception for analytical convenience.
I see two categories of answers that need to be looked at before looking at all the answers in total.
First category contains the only possible right answers given the preconditions:
#1: 1-A and 2-A are Alder, 1-B and 2-B are Ash.
#2: 1-A and 2-A are Ash, 1-B and 2-B are Alder.
Now analyze. Of these 2 answers, #2 is 75%, or mostly, correct. #1 is only 25% correct. Far more people in this grouping chose the mostly correct option. Approx. 75% of them.
More right than wrong.
Now look at the remaining answers (the ones that don't fit the stated preconditions):
#3: I can hear a difference between the "1" recordings, but not the "2" recordings
#4: I can hear a difference between the "2" recordings, but not the "1" recordings
#5: I can't hear a difference between any of them!
#3 is 100% correct. #4 is 0% correct. #5 is 50% correct.
Now analyze: Only 5% of this grouping answered #4. The majority (55%) chose the answer that was evenly correct/incorrect. There was a good showing for the runner up at 40% for the answer that was totally correct. If you take away answer #5, then 98.2% chose the best answer.
More right than wrong.. Adding in answer #5, 95% of the people in this group still avoided the most incorrect answer in the entire poll.
More right than wrong.. In fact, the only way in my entire analysis to make the answer
More wrong than right is to add #5 and #4 together here and compare it against #3. But since #5 is neither mostly right or mostly wrong, that is a stretch.
Now analyze all the results together. The 2 best answers were: #3, #2 and the 2 worst answers were #4, #1. In this grouping, 77.8% of respondents voted for the best answers. Many more people in the entire poll gravitated toward right or mostly right answers than wrong or mostly wrong.
More right than wrong.. Even if you take answer #5, toss that into the mostly "wrong" pile as I did previously, the answers are still
More right than wrong..
BTW, I don't really care very much about the body wood argument itself. I would never type this much on that debate alone ... but you drew me in because of poor analysis!

Thanks.
Bottom line: The results seem to indicate that the change is both
subtle AND
discernable.
Ultimately, to those with excellent hearing, these sound files serve as a good demonstration of that, IMO. Everyone has to understand something important: Like eyes, ears are not all made equal. You are ALWAYS going to have some people who can't discern any difference and some that can. That is just the way it is. Polls aren't going to change that anymore than a poll could help me see better without glasses.
(*) I happened to choose the best answer (#3), but I almost chose the next right answer (#2) thanks to preconditioning. In the end I decided to base my answer solely on my ears even if it meant I was wrong. I literally had to say to myself in choosing #3, "This is apparently wrong, but it is what I hear". I didn't care about being right or wrong, just participating.
P.S.: I could think of better ways to write this test for more meaningful results and less complex analysis.