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Armed with Science
7/16/2009 3:10 PM UTC
Has there been work with concurrent polygraph and FMRI? (Answer part 3) I am not sure if studies of deception have been done using simultaneous EEG (electroencephalograph) and polygraph, but this should be very feasible since the electrodes do not overlap for either device. The only problem here is the sampling rate - EEGs sample at one frequency while the polygraph channels sample at a different rate.
7/16/2009 3:09 PM UTC
Has there been work with concurrent polygraph and FMRI? (Answer part 2) Kozel et al. (2008) conducted a study to determine if electrodermal activity (EDA aka skin conductance = one channel of the polygraph) improved their diagnostic ability to determine deceptive responding. They found that adding EDA did not improve their ability to detect deception, however, they were able to correlate brain areas to EDA.
Has there been work with concurrent polygraph and FMRI? (Answer part 1) Yes there has been. It is difficult because the polygraph instrumentation needs to be MRI safe. Also, some data you see in the polygraph results might be due to extraneous factors, not deception. For example, when we tried to collect skin conductance data, the clanking of the gradients at the start of a scan made the subject's skin conductance jump. However, it fell and did not change much as as the subject became acclimated
7/16/2009 3:05 PM UTC
During your imaging paradigm, were there any motion/movement differences between "truth" v. "deception? (Answer part 2) Also, it is difficult to compare these scans to the group since they don't line up. The fMRI activation shows up as pixels (and clusters of pixels) so if there is too much movement, the activation you see might appear to be part of one cortical structure when it is actually part of another as well.
During your imaging paradigm, were there any motion/movement differences between "truth" v. "deception? (Answer part 1) There were no measureable differences in movement between the truth and deception conditions. This might be that small movements are corrected for in data postprocessing. Scans with too much movement are thrown out of the analysis because because it becomes very difficult to align the subject's brain to the template used to identify structures and conduct analysi
McULTRA_Nuggets
7/15/2009 6:19 PM UTC
During your imaging paradigm, were there any motion/movement differences between "truth" v. "deception?"
7/15/2009 6:16 PM UTC
Has there been work with concurrent polygraph and FMRI?
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