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Mschlnbrg
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 Posted: Thu Aug 28, 2003 11:36 am Post subject: Beyond Polygraphs |
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This is a couple of months old, but just came across it recently.
What I am interested in, if anyone knows or has any thoughts, is what sort of
false positives or false negatives one might expect of people with "atypipcal"
neurotypes.
Have recently become interested in autism, and my research is still pretty
preliminary, furthermore have had no previous cognitive science background
beyond the occasional popular article, so is not yet solidified in my mind.
But the prefrontal cortex is implicated in both autism and schizophrenia.
My initial thought concerning autistics was that perhaps any, not quite sure
how to phrase it properly but let>s say complex associations would require
greater cognitive effort (please excuse my liberal use of made up terms)
leading to a false positive.
My second thought was that if the prefrontal cortex is affected, perhaps some
of its functions are perfomed elsewhere, which might lead to a false negative.
Very slim support for the latter came yesterday when I came across this in
"Synaptic Self" re the Stroop test:
"Schizophrenics, who are believed to have frontal dysfunction, also do poorly.
Functional imaging studies by several groups have shown that the prefrontal
cortex is activated during the conflict condition in normal subjects but not in
schizophrenics."
excerpt from the article that prompted all this:
Scientists build detector that looks where lies are born
By Joann Loviglio
ASSOCIATED PRESS
Monday, June 9, 2003
PHILADELPHIA -- In the quest to build a better lie detector, scientists are
seeking to go beyond the body>s indirect signals to the very seat of deceit:
the brain.
One researcher has built a headband outfitted with lights and detectors able to
`sense blood-flow changes in the brain. Another uses magnetic-resonance imaging
to snap several split-second pictures.
Britton Chance, a biophysicist at the University of Pennsylvania, leads the
headband project, which uses near-infrared light to peek at the brain>s
prefrontal cortex, the place where people make decisions -- and where lies are
born.
Research subjects wearing the headband are told to answer some questions
truthfully and others deceptively.
At the moment a subject makes the decision to lie, before even uttering it,
there>s a milliseconds-long burst of blood flow. Those bursts are read by the
sensors and show up as spikes on a laptop computer.
from:
www.statesman.com/business/content/auto/epaper/editions/
today/business_e31ee8dd0215c12b002c.html |
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Wolf Kirchmeir
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| Posted: Thu Aug 28, 2003 11:46 pm Post subject: Re: Beyond Polygraphs |
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On 28 Aug 2003 06:36:26 GMT, Mschlnbrg wrote:
[quote]At the moment a subject makes the decision to lie, before even uttering it,
there>s a milliseconds-long burst of blood flow. Those bursts are read by the
sensors and show up as spikes on a laptop computer.
[/quote]
Same thing happens when people construct or parse a negative sentence. So
---
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Best Wishes,
Wolf Kirchmeir, Blind River ON
"Not that brains are everything --
you>ll also need a skull to put them in." (Nancy Franklin, 1997)
<just one w and plain ca for correct address> |
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Mschlnbrg
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| Posted: Fri Aug 29, 2003 11:50 pm Post subject: Re: Beyond Polygraphs |
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[quote]Same thing happens when people construct or parse a negative sentence. So
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Best Wishes,
Wolf Kirchmeir, Blind River ON
[/quote]
Hadn>t thought of that, but sounds reasonable.
Was interested in atypical neurotypes specifically, but don>t mind at all
hearing about any general considerations either.
Thanks |
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