Subject: [AUDITORY] Auditory target motion perception in VAE From: Frederico Pereira <pereira.frederico@xxxxxxxx> Date: Wed, 6 Apr 2022 16:27:41 +0100--00000000000045e8b405dbfe017e Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Dear Auditory List, Hoping this email finds you all well. Me and colleagues have been conducting some experiments with participants with the aim of characterizing the perception of movement of a virtual auditory target stimulus. The experiment is fundamentally simple: The participant listens over headphones to a 600ms band-passed noise signal (150 to 8000Hz) and responds to which of leftward or rightward movement direction it was perceived. Signals are always coded to be in the frontal hemisphere, in the horizontal plane describing different arc lengths (varying angular velocity). We are running these experiments at various orders of ambisonic encoding, Supported by the "snapshot" theory, that motion emerges from successive discrimination of target location over time and, confirmation that higher encoding orders result in better localisation of fixed targets, we expect better discrimination at higher orders, thus the reduction of the Minimum audible movement angle (MAMA) at finer encoding resolutions, but: - So far this is not happening....my first reaction was to verify ITDs and ILDs produced by the software engine, they seem in agreement to stimulus movement. The engine we are using is quite popular amongst scientists, being distributed (open source) by a highly reputed investigation team. - Something that we are noticing is a greater difficulty from participants to recognize towards the front arc movements in relation to towards the back (but all in the frontal hemisphere). It may be that thi= s difficulty arises from a poorer ability on localising the onset of the stimulus, as it is more lateralized in frontward movements...? There is limited literature on the perceptual evaluation of auditory moving targets, even less so on virtual audio environments (stimulus presented over headphones). Are there any of you who came across experiences or studies reporting similar hurdles? I=C2=B4d be very interested in hearing from you if you have any comments or further questions, or just willing to discuss this facet of spatial hearing. Best, - Frederico --=20 Frederico Pereira Mobile:+61409066693 Email:pereira.frederico@xxxxxxxx --00000000000045e8b405dbfe017e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Dear Auditory List,<div>Hoping this email finds you all we= ll.<br><div><br></div><div>Me and colleagues have been conducting some expe= riments with participants with the aim of characterizing the perception of = movement of a virtual auditory target stimulus.=C2=A0=C2=A0</div><div>The e= xperiment is fundamentally simple: The participant listens over headphones = to a 600ms band-passed noise signal (150 to 8000Hz) and responds to which o= f leftward or rightward movement direction it was perceived. Signals are al= ways coded to be in the frontal hemisphere, in the horizontal plane describ= ing different arc=C2=A0lengths (varying angular velocity). We are running t= hese experiments at various orders of ambisonic encoding,</div><div><br></d= iv><div>Supported by the "snapshot" theory, that motion emerges f= rom successive=C2=A0discrimination of target location over time and, confir= mation that higher encoding orders result in better localisation of fixed t= argets, we expect better discrimination at higher orders,=C2=A0 thus the re= duction of the Minimum audible movement angle (MAMA) at finer encoding reso= lutions, but:</div><div><ul><li>So far this is not happening....my first re= action was to verify ITDs and ILDs produced by the software engine, they se= em in agreement to stimulus movement.=C2=A0 The engine we are using is quite popular amongst scientists, being distribu= ted=C2=A0(open source)=C2=A0by a highly reputed investigation team.=C2=A0</= li><li>Something that we are noticing is a greater difficulty from particip= ants to recognize towards=C2=A0the=C2=A0front arc movements in relation to = towards=C2=A0the back (but all in the frontal hemisphere). It may be that t= his difficulty arises from a poorer ability on localising the onset of the = stimulus, as it is more lateralized in frontward movements...?</li></ul><di= v>There is limited literature on the perceptual evaluation of auditory movi= ng targets, even less so on=20 virtual audio environments=C2=A0 (stimulus presented over headphones).</div= ><div>Are there any of you who came across experiences or studies reporting= similar hurdles?=C2=A0</div></div><div><br></div><div>I=C2=B4d be very int= erested in hearing from you if you have any comments or further questions, = or just willing to discuss this facet of spatial hearing. </div><div><br></= div><div>Best,</div><div><br></div><div>- Frederico</div><div><br></div><di= v><br></div><div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" data-sma= rtmail=3D"gmail_signature">Frederico Pereira<br>Mobile:+61409066693<br><a h= ref=3D"mailto:Email%3Apereira.frederico@xxxxxxxx" target=3D"_blank">Email:= pereira.frederico@xxxxxxxx</a></div></div></div></div> --00000000000045e8b405dbfe017e--