The effects of asymmetric vs. symmetric probability of targets following probe and irrelevant stimuli in the complex trial protocol for detection of concealed information with P300

A novel countermeasure against the reaction time index of countermeasure use in the P300-based complex trial protocol for detection of concealed information

“…Conditional probabilities of a target as opposed to a non-target stimulus following a probe or irrelevant was 1:4 regardless of which stimulus is presented. As shown in previous research (Rosenfeld et al, 2009) this 'symmetric' protocol does not affect behavioral or ERP results. Thus target versus non-target trial status was not used as a factor in analysis as probe RTs and ERPs followed by targets or non-targets were combined, and likewise with irrelevants.…”

“…This method is more sensitive to the detection of deception than the base-peak method used in earlier studies (Meijer, et al, 2007;Soskins, et al, 2001). The exact method has been detailed in many previous papers (Meijer, et al, 2007;Meixner and Rosenfeld, 2010;Rosenfeld and Labkovsky, 2010;Rosenfeld, et al, 2008;Rosenfeld, et al, 2004;Rosenfeld, et al, 2009;Soskins, et al, 2001;Winograd and Rosenfeld, 2011;Meixner and Rosenfeld, n.d). In this report, a window of 300-650 ms was used to find peak positivity and 650-1350 ms for peak negativity.…”

“…This process creates a distribution of probe-minusirrelevant P300 differences for each subject. Past studies (Meijer, et al, 2007;Meixner and Rosenfeld, 2010;Rosenfeld and Labkovsky, 2010;Rosenfeld, et al, 2008;Rosenfeld, et al, 2004;Rosenfeld, et al, 2009;Soskins, et al, 2001;Winograd and Rosenfeld, 2011;Meixner and Rosenfeld, n.d) detailed the bootstrap method extensively. It registers a 'guilty' decision when a probe P300 is significantly larger than the P300 average of all irrelevants (Iall) on 90 out of 100 (p b .1) iterations of the bootstrap.…”

Brain fingerprinting: a comprehensive tutorial review of detection of concealed information with event-related brain potentials

“…Rosenfeld and colleagues have published several studies using a ''complex trial protocol'' that fails to meet this and other standards and consequently is unusable in the field Meixner and Rosenfeld 2010;Meixner and Rosenfeld in press;Rosenfeld et al 2008Rosenfeld et al , 2009Winograd and Rosenfeld in press; for a review, see Farwell 2011a, b;2012). In addition, all of these studies failed to meet 17 of the 20 Brain Fingerprinting standards.…”

Evidence suggesting superiority of visual (verbal) vs. auditory test presentation modality in the P300-based, Complex Trial Protocol for concealed autobiographical memory detection

“…Each of the target/non-target stimuli was randomly presented on approximately 1/5 of trials in the delayed ("Part 2") portion of each series. The probability of a target following a probe or any single irrelevant was .2 (a symmetric protocol; Rosenfeld et al, 2009). …”