Subject: Re: How do I measure resonance? From: Jose Ignacio Alcantara <jia10@xxxxxxxx> Date: Mon, 12 Mar 2012 18:35:35 +0000 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>--Apple-Mail-10--1064665866 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Dear Mike, The skull has a number of open air-filled chambers, which could in = principle act as resonators: the paranasal sinuses in the bones = surrounding the nasal cavity; two large maxillary sinuses in the cheek = area; two frontal sinuses just above the orbits; several small sinuses = between the orbits; and two sphenoid sinuses at the base of the skull. = Certainly professional singers report resonant-like sensations in the = frontal sinuses when they are producing a note with maximum carrying = power. If you know the volume of these chambers (from MRI scans), then it is = easy to calculate what the respective resonant frequencies are; however, = note that they are mostly all lined with a mucosal layer, and also prone = to filling as a result of various infectious agents; thus, to be = certain, you would probably have to rule out factors such as sinusitis = and fungal infections. I doubt that you'll cause anyone's head to explode, but you would = obviously have to use bone-conducted signals, and this will rule out = relatively low frequencies at levels greater than about 50-60 dB (HL), = as vibrotactile cues will confound any reports of resonance you might = get. Cheers, Jos=E9 On 12 Mar 2012, at 17:55, Gordon, Michael wrote: > Dear List, > =20 > I=92m hoping some of you might have a few ideas about how one can = measure the resonant characteristics of the human body? Specifically I=92m= trying to figure out what the resonant frequencies of a person=92s = head/skull might be. Is there a way or established methods to do this? = Are there any dangers to playing the resonant frequency of a person=92s = head to them? > =20 > I=92m hoping to do some investigations into whether the resonant = characteristics of a person=92s body might interact with various = acoustic perceptual judgments. Many thanks in advance for your = responses. > =20 > You are welcome to email me directly and I will post a summary of = responses to the list next week. > =20 > Cheers, > =20 > Mike > =20 > =20 > -- > Dr. Michael S. Gordon > Department of Psychology > William Paterson University > Gordonm10@xxxxxxxx > =20 > =20 Dr Jos=E9 Ignacio Alc=E1ntara Department of Experimental Psychology University of Cambridge Downing Street Cambridge, UK CB2 3EB Phone: 44 (0)1223 764412 Fax: 44 (0)1223 333564 Fellow of Fitzwilliam College Cambridge, UK CB3 0DG Phone: 44 (0)1223 332026 --Apple-Mail-10--1064665866 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 <html><head><base href=3D"x-msg://235/"></head><body style=3D"word-wrap: = break-word; -webkit-nbsp-mode: space; -webkit-line-break: = after-white-space; ">Dear Mike,<div><br></div><div>The skull has a = number of open air-filled chambers, which could in principle act as = resonators: the paranasal sinuses in the bones surrounding the nasal = cavity; two large maxillary sinuses in the cheek area; two frontal = sinuses just above the orbits; several small sinuses between the orbits; = and two sphenoid sinuses at the base of the skull. Certainly = professional singers report resonant-like sensations in the frontal = sinuses when they are producing a note with maximum carrying = power.</div><div><br></div><div>If you know the volume of these chambers = (from MRI scans), then it is easy to calculate what the respective = resonant frequencies are; however, note that they are mostly all lined = with a mucosal layer, and also prone to filling as a result of various = infectious agents; thus, to be certain, you would probably have to rule = out factors such as sinusitis and fungal = infections.</div><div><br></div><div>I doubt that you'll cause anyone's = head to explode, but you would obviously have to use bone-conducted = signals, and this will rule out relatively low frequencies at levels = greater than about 50-60 dB (HL), as vibrotactile cues will confound any = reports of resonance you might get.</div><div><br></div><div>Cheers, = Jos=E9</div><div><br></div><div><br></div><div><br><div><div>On 12 Mar = 2012, at 17:55, Gordon, Michael wrote:</div><br = class=3D"Apple-interchange-newline"><blockquote type=3D"cite"><span = class=3D"Apple-style-span" style=3D"border-collapse: separate; = font-family: Helvetica; font-style: normal; font-variant: normal; = font-weight: normal; letter-spacing: normal; line-height: normal; = orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; = widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; = -webkit-border-vertical-spacing: 0px; = -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: = auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div = lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"WordSection1" = style=3D"page: WordSection1; "><div style=3D"margin-top: 0in; = margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: = 11pt; font-family: Calibri, sans-serif; ">Dear = List,<o:p></o:p></div><div style=3D"margin-top: 0in; margin-right: 0in; = margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: = Calibri, sans-serif; "><o:p> </o:p></div><div style=3D"margin-top: = 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; = font-size: 11pt; font-family: Calibri, sans-serif; ">I=92m hoping some = of you might have a few ideas about how one can measure the resonant = characteristics of the human body? Specifically I=92m trying to figure = out what the resonant frequencies of a person=92s head/skull might be. = Is there a way or established methods to do this? Are there any dangers = to playing the resonant frequency of a person=92s head to = them?<o:p></o:p></div><div style=3D"margin-top: 0in; margin-right: 0in; = margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: = Calibri, sans-serif; "><o:p> </o:p></div><div style=3D"margin-top: = 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; = font-size: 11pt; font-family: Calibri, sans-serif; ">I=92m hoping to do = some investigations into whether the resonant characteristics of a = person=92s body might interact with various acoustic perceptual = judgments. Many thanks in advance for your = responses.<o:p></o:p></div><div style=3D"margin-top: 0in; margin-right: = 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; = font-family: Calibri, sans-serif; "><o:p> </o:p></div><div = style=3D"margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; = margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; = ">You are welcome to email me directly and I will post a summary of = responses to the list next week.<o:p></o:p></div><div style=3D"margin-top:= 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; = font-size: 11pt; font-family: Calibri, sans-serif; = "><o:p> </o:p></div><div style=3D"margin-top: 0in; margin-right: = 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; = font-family: Calibri, sans-serif; ">Cheers,<o:p></o:p></div><div = style=3D"margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; = margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; = "><o:p> </o:p></div><div style=3D"margin-top: 0in; margin-right: = 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; = font-family: Calibri, sans-serif; ">Mike<o:p></o:p></div><div = style=3D"margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; = margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; = "><o:p> </o:p></div><div style=3D"margin-top: 0in; margin-right: = 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; = font-family: Calibri, sans-serif; "><o:p> </o:p></div><div = style=3D"margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; = margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; = "><span style=3D"font-size: 10.5pt; font-family: Consolas; = ">--<o:p></o:p></span></div><div style=3D"margin-top: 0in; margin-right: = 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; = font-family: Calibri, sans-serif; "><span style=3D"font-size: 10.5pt; = font-family: Consolas; ">Dr. Michael S. = Gordon<o:p></o:p></span></div><div style=3D"margin-top: 0in; = margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: = 11pt; font-family: Calibri, sans-serif; "><span style=3D"font-size: = 10.5pt; font-family: Consolas; ">Department of = Psychology<o:p></o:p></span></div><div style=3D"margin-top: 0in; = margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: = 11pt; font-family: Calibri, sans-serif; "><span style=3D"font-size: = 10.5pt; font-family: Consolas; ">William Paterson = University<o:p></o:p></span></div><div style=3D"margin-top: 0in; = margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: = 11pt; font-family: Calibri, sans-serif; "><span style=3D"font-size: = 10.5pt; font-family: Consolas; "><a href=3D"mailto:Gordonm10@xxxxxxxx" = style=3D"color: blue; text-decoration: underline; "><span style=3D"color: = blue; ">Gordonm10@xxxxxxxx</span></a><o:p></o:p></span></div><div = style=3D"margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; = margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; = "><span style=3D"font-size: 10.5pt; font-family: Consolas; = "><o:p> </o:p></span></div><div style=3D"margin-top: 0in; = margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: = 11pt; font-family: Calibri, sans-serif; "><span style=3D"font-size: = 10.5pt; font-family: Consolas; "><o:p></o:p></span></div><div = style=3D"margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; = margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; = "><o:p> </o:p></div></div></div></span></blockquote></div><br><div> <span class=3D"Apple-style-span" style=3D"border-collapse: separate; = color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; = font-variant: normal; font-weight: normal; letter-spacing: normal; = line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; = text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; = -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: = 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: = auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span = class=3D"Apple-style-span" style=3D"border-collapse: separate; color: = rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: = normal; font-variant: normal; font-weight: normal; letter-spacing: = normal; line-height: normal; orphans: 2; text-indent: 0px; = text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; = -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: = 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: = auto; -webkit-text-stroke-width: 0px; "><div style=3D"word-wrap: = break-word; -webkit-nbsp-mode: space; -webkit-line-break: = after-white-space; "><span class=3D"Apple-style-span" = style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: = Helvetica; font-size: medium; font-style: normal; font-variant: normal; = font-weight: normal; letter-spacing: normal; line-height: normal; = orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; = widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; = -webkit-border-vertical-spacing: 0px; = -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: = auto; -webkit-text-stroke-width: 0px; "><div style=3D"word-wrap: = break-word; -webkit-nbsp-mode: space; -webkit-line-break: = after-white-space; "><span class=3D"Apple-style-span" = style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: = Helvetica; font-size: medium; font-style: normal; font-variant: normal; = font-weight: normal; letter-spacing: normal; line-height: normal; = orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; = widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; = -webkit-border-vertical-spacing: 0px; = -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: = auto; -webkit-text-stroke-width: 0px; "><div style=3D"word-wrap: = break-word; -webkit-nbsp-mode: space; -webkit-line-break: = after-white-space; "><div>Dr Jos=E9 Ignacio Alc=E1ntara<br><br>Department = of Experimental Psychology<br>University of Cambridge<br>Downing = Street<br>Cambridge, UK<br>CB2 3EB<br>Phone: 44 (0)1223 764412<br>Fax: = 44 (0)1223 333564<br><br>Fellow of Fitzwilliam College<br>Cambridge, = UK<br>CB3 0DG<br>Phone: 44 (0)1223 = 332026<br></div><div><br></div></div></span><br = class=3D"Apple-interchange-newline"></div></span><br = class=3D"Apple-interchange-newline"></div></span><br = class=3D"Apple-interchange-newline"></span><br = class=3D"Apple-interchange-newline"> </div> <br></div></body></html>= --Apple-Mail-10--1064665866--