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:: Volume 21, Issue 2 (2015) ::
Ir J Forensic Med 2015, 21(2): 75-82 Back to browse issues page
Lie Detection by Replacing the Arterial Photoplethysmograph Signal in Poly graphy & Using Linear Discriminate Analysis in MATLAB Software
Mohammad amin Younessi heravi 1, Mahdi Azarnoosh, Rasul Sarafan
1- , a.younessi7@gmail.com
Abstract:   (2784 Views)

     Background: Finding methods for lie detection is one of the main concerns in human Societies. The aim of this study was to design a system to evaluate the arterial photoplethysmograph signal in polygraph system and submit it as a new signal on the polygraph.

             Methods: The data set included psychophysiology signals and was done through an inductive test and by using classic polygraph device in two groups. After recording the signals, the signals noises were removed and time features were extracted. Statistical analysis was done by ANOVA and T-test. Consequently data were classified and accuracy coefficient was calculated by applying these features to Linear Discriminate Analysis LDA. All data processing was done in MATLAB software.

             Findings: 20 men participated in the study. The results showed that changing of arterial photoplethysmograph signal has significantly reduced in target question (P=0.022) and it could create a higher accuracy in lie detection.  By combining signals and using arterial photoplethysmograph, the best results were obtained and the accuracy was calculated as 81.33%.

             Conclusion: by replacing a new signal in this study, the percentage of accuracy was calculated comparable with other methods of polygraph. So this new method can be suggested for use as a lie screening system.

Keywords: Therapeutic Abortion, Mother\'s Health, Baby\'s Disability, Hardship
Full-Text [PDF 1240 kb]   (1465 Downloads)    
Article Type: Original Research | Subject: Forensic Medicine
Received: 2012/06/20 | Accepted: 2014/01/28 | Published: 2015/09/23
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younessi heravi M A, azarnoosh M, sarafan R. Lie Detection by Replacing the Arterial Photoplethysmograph Signal in Poly graphy & Using Linear Discriminate Analysis in MATLAB Software. Ir J Forensic Med. 2015; 21 (2) :75-82
URL: http://sjfm.ir/article-1-693-en.html


Volume 21, Issue 2 (2015) Back to browse issues page
مجله پزشکی قانونی ایران Iranian Journal of Forensic Medicine
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