Concerning the taste experiment: If PTC was the only bitter substance tested, then he is probably PTC blind--not at all unusual. (And probably not the trigger of a migraine.) If so, he would be less sensitive to other bitters (coffee, etc) but not insensitive. Oil of almond may be bitter, but it is also a strong olfactory stimulus. You should use something like quinine.
Why do the taste map? This is a caraciture of actual differences in taste senstivity over the tongue as has been discussed several times on this list. Differences in threshold are small--only on the order of 2 or 3 to 1 from place to place (except the center of the tongue, which is insensitive to taste.) They would probably be missed in any small study. Differences in suprathreshold magnitudes would also be difficult to measure accurately in such a demonstration.
don
Donald McBurney
University of Pittsburgh
Jim Matiya wrote:
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Jim MatiyaCarl Sandburg High School
131st and LaGrange Road
Orland Park, IL 60462
Lewis University. Romeoville, IL
Moraine Valley Comm. College. Palos Hills, IL
Illinois Virtual High School. Cyberspace?
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Webpages: http://www.d230.org/cs/matiya
>From: "Jodi Gabert" <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Subject: A favor
>Date: Mon, 6 Oct 2003 15:41:16 -0400
>
>Hi Jim,
>For some reason, TIPS is not working for me, can't even access the home site. Anyhow, could you post a question for me?
>
>Recently, my hs intro psychology class finished a sensory lab (taste map, two point threshold, etc). One of my students came to me and appologized because he could not see an afterimage when asked to focus on an orange and then a green strip of paper then look at a white sheet of paper.
>He isn't color blind,we checked that out. But what specifically would cause the inability not to see an afterimage?
>Also, same kid, different question. When we did a supertaster lab (used PTC paper), he recorded no sense of bitter, the next day he asked if there could be a delayed reaction to PTC paper because three hours later he had a migrane. I told him to not do the bitter (oil of almond) taste map in the lab because of my concerns it could trigger a migrane. He did and had no aftereffect.
>Can any Tipsters help me out?
>
>Jodi Gabert
>Reed City HS
>[EMAIL PROTECTED]
>
>Thanks Jim, hopefully I'll be able to access TIPS all by myself soon. But you didn't answer my last question..
>Where do you get the Freud Bobbleheads???
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