In Reply to: Okay I have reviewed the references you gave and reread the article cited. Yes IMD could not be a criticism posted by Norm on June 2, 2006 at 12:27:51:
Don't think so. Kaoru and Shogu showed that once they redesigned their experiments to eliminate IM distortion in the speakers involving ultrasonic frequencies, then the graduate students could not disprove the null hypothesis.Now, adding high tech things like reading brain waves does not remove the need to control for IM, as otherwise the difference in the brain waves could be explained by the IM distortion products in the audible range. High tech does not remove the requirements for proper design and controls.
As I said in the post you couldn't link to, this does not prove that people can NOT hear ultrasonic frequencies, but it does show that previous experiments which lacked controls for IM in the audible range had not proved anyone can.
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Follow Ups
- Was IMD controlled for in the previous studies? - Pat D 17:56:07 06/02/06 (6)
- The article is not by Kaoru and Shogu, does not use graduate students, and does avoid IMD. - Norm 20:44:38 06/02/06 (5)
- Re: The article is not by Kaoru and Shogu, does not use graduate students, and does avoid IMD. - Pat D 18:15:36 06/03/06 (4)
- As jj would say, do the research. I gave the full citation. nt - Norm 20:28:34 06/03/06 (3)
- I ask again, how did they eliminate IMD in the speakers - Pat D 21:33:21 06/03/06 (2)
- The HFC alone went through the supertweeters and no one heard it when it was played alone - Norm 09:06:55 06/04/06 (1)
- That's a good argument. - Pat D 16:04:46 06/04/06 (0)