That raises the interesting question of 'how transient is a transient' to be effective in respect of precedence effects? - my guess would be that the figure would not be the same in the median and azimuthal planes.
With you noise bursts and 'proper' instruments, was the 7dB constant, or did it vary with stimulus characteristics? Regards ppl Dr. Peter Lennox Senior Lecturer in Perception College of Arts University of Derby, UK e: p.len...@derby.ac.uk t: 01332 593155 https://derby.academia.edu/peterlennox https://www.researchgate.net/profile/Peter_Lennox -----Original Message----- From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Hyunkook Lee Sent: 10 December 2015 15:49 To: sursound@music.vt.edu Subject: Re: [Sursound] vertical precedence and summing localisation (wallis and lee 2015) On Thu Dec 10 07:26:49 EST 2015, Peter Lennox wrote: > Notably, Shinn-Cunningham also describes the disproportionate > weighting of onsets in precedence effects : " Perceptually, judgments > of the direction of a sound source depend strongly on spatial > information in the onset of sound and relatively weakly on spatial > information in later-arriving portions of sound (e.g., see Brown and Stecker > 2010)" - whereas > in your tests, the onset transients were attenuated - is > that right? Yes, we used continuous pink noise, and it is true that in the horizontal sense, onset transient is known to be an essential factors for triggering the precedence effect. But most of the studies reporting this used pure tones (click train vs steady state). Of course steady state pure tones are hard to localise in rooms, but noise is not steady state! Like Hartmann (1993) claimed, noise has lots of random fluctuations, which can be described as a series of small transients that cause interaural time differences themselves, thus potentially triggering the precedence effect. In fact, there are several studies (Tobias and Zerlin [1959] and Perrott and Baars [1974]) showing that for noise sources, ongoing cues become more effective for localisation than the onset transient as the duration of the signal increase. Additionally, the musical sources we have tested for vertical delay included transient sources like conga, bongo, castanet, acoustic guitar, speech, etc. but the precedence effect did not work for any of these sources with time delay only, meaning that the delayed signal still required a certain amount of level reduction around 7 dB to have localisation at the perceived position of the primary source. This was also the case for our recent experiments using noise burst stimuli (1ms onset). This result will be published soon. Cheers, Hyunkook ========================================= Dr Hyunkook Lee, BMus(Tonmeister), PhD, MAES, FHEA Senior Lecturer in Music Technology Leader of the Applied Psychoacoustics Laboratory (APL) http://www.hud.ac.uk/research/researchcentres/mtprg/projects/apl/ School of Computing and Engineering University of Huddersfield Huddersfield HD1 3DH United Kingdom Phone: +44 (0)1484 471893 Email: h....@hud.ac.uk Office: CE 2 /14a University of Huddersfield inspiring tomorrow's professionals. [http://marketing.hud.ac.uk/_HOSTED/EmailSig2014/EmailSigFooter.jpg] This transmission is confidential and may be legally privileged. If you receive it in error, please notify us immediately by e-mail and remove it from your system. If the content of this e-mail does not relate to the business of the University of Huddersfield, then we do not endorse it and will accept no liability. _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. The University of Derby has a published policy regarding email and reserves the right to monitor email traffic. If you believe this was sent to you in error, please select unsubscribe. Unsubscribe and Security information contact: info...@derby.ac.uk For all FOI requests please contact: f...@derby.ac.uk All other Contacts are at http://www.derby.ac.uk/its/contacts/ _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
