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Audiophile Neuroscience

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Audiophile Neuroscience last won the day on August 11

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    David

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  1. i can very much attest to both the quality and performance of this gear. Pete was my best friend and so I have heard all the gear many times. The Bricasti DAC is in mint condition and was factory upgraded to the hardware feature set and firmware as described. I previously owned the same DAC and consider it world class, having been designed by the same ex Mark Levinson team that engineered the legendary 31.5/30.6 back in the 90's. Bricasti Review The coveted Gryphon guideline reference cables are top of the line IMO and are the "blue" more expensive version compared to the "red" guidelines. I continue to use them in my own Gryphon based system. They are the XLR connectors and a must in a fully balanced differential setup The pachanko speaker cables are quite neutral sounding to my ear from an innovative designer renowned for his cables.
  2. Yes, I agree, this and other studies combining a behavioral and neurological response suggest perception has occurred. This had previously been demonstrated for "resting" or inactive subjects. As noted in the 2017 study increased alpha activity is seen during a relaxed attentional state and thought to be a signifier of enhanced processing, and Beta activity has been shown to increase when arousal and vigilance level increase. Kuribayashi and Nittono (2014) found that "the difference between full-range and high-cut sounds appeared in the right inferior temporal cortex, whereas the main source of the alpha-band activity was located in the parietal-occipital region." "The finding that the alpha-band activity difference was obtained in specific but not whole regions is suggestive that this increase may reflect an activity related to task performance rather than a global arousal effect (Barry et al.2007)." In the 2017 study they felt that EEG and Event related potentials supported high-resolution audio with inaudible high-frequency components "enhances the cortical activity related to the attention allocated to task-relevant stimuli."
  3. Hi LHC, just a little fun with Grant's cited evidence...
  4. I agree with you....or OTOH we could just go with Wikipedia ❕
  5. Let's just say it is controversial. I am guessing the NHK paper you cite mentioned was the 2003 Perceptual Discrimination between Musical Sounds with and without Very High Frequency Components by Nishiguchi et al and which commented on the 2000 Oohashi paper. I agree with the conclusion "The results showed that we can still neither confirm nor deny the possibility that some subjects could discriminate between musical sounds with and without very high frequency components." Nishiguchi went on to publish other papers such as Perceptual discrimination of very high frequency components in wide frequency range musical sound Author(s): Nishiguchi et al Source: APPLIED ACOUSTICS Volume: 70 Issue: 7 Pages: 921-934 JUL 2009 "Tests showed that the subjects could discriminate between musical sounds with and without very high frequency components [above 20KHz] . This paper describes these subjective evaluations in terms of reproducing such very high frequency components in musical Sound." Neither of those NHK papers AFAIK performed neurological testing to correlate with the behavioral responses. There have been numerous studies since that do indicate neurological and behavioral responses.
  6. Thanks LHC, I certainly have some of these references and at least a couple dozen on Oohashi's "Hypersonic effect". Most studies seem to point to both behavioral responses and brain activity responses such as EEG alpha waves or other correlates indicating a perception has occurred in relation to ultrasonic otherwise inaudible sounds. Interestingly there appears to be a "lag phase" for some of the effects which would seem to correspond to many people's experience for preferring longer time periods to evaluate sound quality, irrespective of the mechanism underpinning the reported differences/preferences. Also, the notion that these perceptions may take place below the level of overt awareness but there is a cumulative effect over time appears to be consistent with the above. IMO this should not be interpreted as being the same as therefore a negligible difference (although some will). A bit of a digression and a stretch regarding relevance is the so called Iowa gambling task where subjects are able to sense a difference in a bad deck of cards with as yet inadequate information to conclude same. Nonetheless they somehow sense it and display autonomic nervous system changes that correlate with the uneasy feeling evoked by the task. This is more about decision making and responses in frontal lobe and amygdala etc but is interesting in the context of how we respond to incoming information that has not quite been fully consciously defined. Call it "gut feel/sensation" if you like Whatever the mechanism, and not suggesting "gut feel" literally or otherwise or for that matter bone conduction over air conduction etc, the other interesting aspect (to me) is that some speculate that the mechanism of hypersonic modulation relates somehow to the initial attack of transients in the musical envelope and associated high frequency component and rise time of the corresponding frequencies extending above 20 Khz (Fourier analysis of a sharp transient attack envelope involving rapid onset of sound and short time to peak amplitude involve high frequency waveforms with rapid signal rise times.) That theory marries nicely with what we know about attack transients being important in influencing our perception of tone/timbre which in turn relates to harmonic content and the dynamics of the attack-delay characteristics of the sound.
  7. Okay, so if we drop insinuations of trickery - yes it was the article that prompted the question. It seemed to come from a reasonable source, Douglas Brooks MS/EE from Stanford University and a Ph.D. from the University of Washington. I am not saying he is right (no appeals to authority), hence my "humble question" based on that statement. If I am understanding, you are saying it is possible to have a 100Hz waveform with a long rise time and a 100Hz waveform with a fast rise time. Does this not broadly accord with what Dr Brooks is saying ? Hearing above 20k is a whole different and contentious issue. Others may or may not be pleading this but speaking only for myself I am not seeing the need to go there. I will apologize at this stage as I have entered the thread late....and had a little difficulty understanding the OP in relation to where it was going with phase. The thread appears to have morphed into the possible justification of HiRez files in general and/or something about ITDs in relation to all of this. Sure but are they mutually exclusive - ie to the extent that the slope areas stay within audible frequencies ?
  8. I think I can only bring more questions than answers. There is a known "striping" arrangement of the auditory cortex for binaural frequency perception that may or may not be relevant and briefly explained here orthogonal auditory cortex EE and EI striping I would also humbly ask whether there is a hard and fast relationship between frequency and rise time as seems to be implied in some of the foregoing discussion, and unless talking about perfectly formed sine waves like single test tones perhaps. rise time vs frequency
  9. Well I didn't reply at all ! Well excluding this reply, which really isn't a reply, so no need to exclude it !🤪
  10. If understanding, and to make it easier for Sally, regarding the roller bearings which come in a set of [3 x bowls and balls] @Eagleeyes 4 sets at $100 = $400 @MartinC 2 sets at $100 = $200 @davothecavo 1 set at $100 @ThirdDrawerDown 1 set at $100
  11. Hi Adam, Can you confirm whether "Set of 3 custom Isolation Roller bearings x4 sets " is 4 sets of 3, so Sally can advise everyone how many sets of 3 are left ? Thanks and Cheers David
  12. Hi all, Sally is getting PMs with technical questions she cannot answer. May I ask you direct those questions to me. To the bricasti, yes I believe the latest firmware, at least the one where they added the extra filters, 15 digital reconstruction filters, six of which are minimum phase and nine of which are linear phase. I would have to confirm the firmware version. I know Pete got the linear power upgrade and other factory upgrades when they came available. We were both lucky enough to have dinner with Brian Zolner owner of Bricasti, so Pete got updates when available. Still, needs to be confirmed.
  13. Hi YM I am Pete's best friend, so please allow me to answer for Sally. You have a good eye! The gryphon amp and preamp are already sold. Yes it was an Antileon Sig. I am impressed! Cheers David
  14. Hi Jamie Pete and I got these air platforms and roller bearings custom made as guided by Barry Diament (famous audio engineer) via my personal communication with Barry. The timber surrounds for the platforms and their rather ingenious design was from Warren, our friend and master cabinet maker, who did CAD drawings and solved all the practical problems. Basically the "air bearings" are bicycle inner tubes inside a timber frame you can read about the story here Anti-Vibration air bearing platforms and Roller bearing devices https://audiophilestyle.com/forums/topic/35143-vibration-air-roller-bearings-thanks-to-barry-warren/ https://www.stereo.net.au/forums/topic/287178-flooring-preference-if-given-the-choice/?tab=comments#comment-4340929 I will post some more pics .
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