Normal Topic Computer polygraphs (Read 2400 times)
Paste Member Name in Quick Reply Box nopolycop
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Computer polygraphs
Nov 5th, 2007 at 4:02pm
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When a chart is made, does the computer calculate the number of beats per minute, the blood pressure, the breathing rate?  Is that displayed on the screen for the polygrapher to see?
  

"Although the degree of reliability of polygraph evidence may depend upon a variety of identifiable factors, there is simply no way to know in a particular case whether a polygraph examiner's Conclusion is accurate, because certain doubts and uncertainties plague even the best polygraph exams."  (Justice Clarence Thomas writing in United States v. Scheffer, 523 U.S. 303, 118 S.Ct. 1261, 140 L.Ed.2d 413, 1998.)
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Re: Computer polygraphs
Reply #1 - Nov 5th, 2007 at 6:02pm
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One may calculate the heart rate and respiration rate by looking at the 5 second time markers on the polygraph chart. Simply count the beats in a 10 second interval and multiply by 6.  Same with respiration rate although a little longer interval is better.  Number of cycles in a 20 second interval multiply by 3.  Blood pressure is not given or calculated.
  
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Re: Computer polygraphs
Reply #2 - Nov 5th, 2007 at 10:57pm
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skip.webb wrote on Nov 5th, 2007 at 6:02pm:
One may calculate the heart rate and respiration rate by looking at the 5 second time markers on the polygraph chart. Simply count the beats in a 10 second interval and multiply by 6.  Same with respiration rate although a little longer interval is better.  Number of cycles in a 20 second interval multiply by 3.  Blood pressure is not given or calculated.


Thank-you Mr. Webb.
  

"Although the degree of reliability of polygraph evidence may depend upon a variety of identifiable factors, there is simply no way to know in a particular case whether a polygraph examiner's Conclusion is accurate, because certain doubts and uncertainties plague even the best polygraph exams."  (Justice Clarence Thomas writing in United States v. Scheffer, 523 U.S. 303, 118 S.Ct. 1261, 140 L.Ed.2d 413, 1998.)
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Computer polygraphs

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