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PubMed2005

Behavioral and physiological measures in the detection of concealed information.

The authors examined the incremental validity of the reaction time (RT) measure beyond that of skin conductance response (SCR) in the detection of concealed information. Participants performed a Stroop-like task in which they named the color of critical and neutral words. Results show that the SCR highly differentiated between the relevant and neutral words. However, the RT demonstrated a significant differentiation only when the critical words denoted personally significant items (e.g., one's own name) and not when they denoted crime-relevant items related to a simulated crime. In both cases, combining the 2 measures yielded no advantage over the use of SCR alone. Thus, although behavioral measures may differentiate between relevant and neutral information in some cases, their practical use is questionable.

Adult↗
PubMed2003

The validity of psychophysiological detection of information with the Guilty Knowledge Test: a meta-analytic review.

The authors performed a meta-analysis based on 169 conditions, gathered from 80 laboratory studies, to estimate the validity of the Guilty Knowledge Test (GKT) with the electrodermal measure. The overall average effect size was 1.55, but there were considerable variations among studies. In particular, mock-crime studies produced the highest average effect size (2.09). Three additional moderators were identified: Motivational instructions, deceptive ("no") verbal responses, and the use of at least 5 questions were associated with enhanced validity. Finally, a set of 10 studies that best approximated applications of the GKT under optimal conditions produced an average effect size of 3.12. The authors discuss factors that might limit the generalizability of these results and recommend further research of the GKT in realistic setups.

Adult↗
PubMed1992

Use of antianxiety drugs as countermeasures in the detection of guilty knowledge.

To evaluate whether antianxiety drugs enable guilty subjects to appear innocent on polygraph tests, we compared the effects of diazepam, meprobamate, and propranolol on the outcome of a guilty knowledge test (GKT). Seventy-five undergraduate students were evenly divided among one innocent and four guilty groups. Subjects in each of the guilty groups received either one of the drugs or a placebo prior to the administration of the GKT and after viewing a videotape that depicted a burglary as seen from the perspective of the burglar. The results showed that drug status had no influence on the outcome of the GKT. Innocent subjects who coincidentally obtained high scores on a recognition memory test covering details of the mock crime tended to obtain higher guilt scores on the GKT.

Adolescent↗
PubMedDate not supplied

Alice-in-Wonderland terminological usage in, and communicational concerns about, that peculiarly American flight of technological fancy. The CQT polygraph.

Alice-in-Wonderland (AW) terminological usage employs basic terms in a systematically misleading and taxonomically anarchic way. The so-called "control" question "test" (CQT) polygraph procedure, which enjoys a controversial but nevertheless scientific status in North America, involves such AW terminological usage. The basic concepts of "test," "control," and "quantification" are loosely employed. There is loose talk about the "detection of deception," which generates the paradox that in the CQT it is in the innocent that deception should be detected. Moreover, deception is not really assessed either in the CQT or in the more scientically-based Guilty Knowledge Test (GKT). Finally, there is loose practice in evaluating the CQT, which should not be primarily assessed in terms of its overall accuracy, but in terms of its specific effects in improving accuracy through the provision of physiological information to the examiner. Such as assessment has not been carried out even in laboratory analogues of polygraphy. The treatment of the CQT exemplifies most psychophysiologists' reluctance to treat basic definitional issues seriously, and also means that opponents of the CQT are unable to communicate clearly about it with non-psychophysiologist professionals and with the lay community.

Arousal↗
PubMed2005

Will the law come running? The potential role of "brain fingerprinting" in crime investigation and adjudication in Australia.

A major feature of the Australian criminal justice system is that jurors assess witness credibility and are the ultimate finders of fact. Recognising the occasional fallibility of humans in detecting truth and deception, the jury's function may be assisted by highly regulated expert evidence about a variety of scientific techniques. A recent scientific development has been the invention of "brain fingerprinting" (BF) by Dr Larry Farwell in the United States. Brain fingerprinting measures brainwave functioning to detect awareness of crime-relevant information in order to distinguish between guilty and innocent suspects. This article considers whether BF could be used for crime investigation and adjudication in Australia. By examining the rules of expert evidence and the principles relating to "novel scientific evidence", the admissibility of BF in the various Australian jurisdictions is evaluated. The utility of BF in criminal investigations and counter-terrorism initiatives is also canvassed. The authors conclude that, at the present time, it is unlikely that expert testimony on BF will be admitted in Australian criminal trials. However, the technique potentially offers other benefits to the criminal justice system, thereby warranting its consideration as a "criminal and investigative tool of the future".

Australia↗
PubMed1991

A comparison of field and laboratory polygraphs in the detection of deception.

This study compared the effectiveness of field and laboratory polygraphs in discriminating guilty and innocent subjects tested using the Control Question Technique (CQT). Subjects were 48 prisoners examined regarding a mock theft in a peer threat context; physiological responses were recorded simultaneously on a Lafayette field polygraph and a Sensor Medics laboratory polygraph. Overall hit rates were essentially the same whether classifications were based on quantitative measures from the laboratory polygraph or on numerical scores from the field polygraph (i.e., 73% and 79%, respectively), and in both cases the best discriminating measures were electrodermal activity and indices of respiration suppression. Further analyses revealed that errors of classification were mostly due to the failure of the available measures to differentiate between relevant and control questions for innocent subjects. These results indicate that the CQT is susceptible to false positive errors when subjects are tested under field-like circumstances, a problem that is not likely to be eliminated by refinements in instrumentation and scoring.

Adult↗
PubMed1984

Clinical utility of the McVaugh and Grow rules for the detection of faking on the Personality Inventory for Children.

Investigated the clinical utility of the McVaugh and Grow (1983) suggestions that Adjustment Scale (ADJ) greater than or equal to 84T indicates faking bad and K greater than or equal to 59T or Social Desirability (SD) greater than or equal to 54T indicates faking good on the Personality Inventory for Children (PIC) in 100 children, aged 6-0 to 12-11, seen in a private, fee-for-service, practice of psychology. Profiles that exceeded the fake bad criterion were found in 35% of the cases, but only one profile met fake good criteria. In contrast to profiles below the faking bad criterion, those profiles with ADJ greater than or equal to 84 were associated with higher levels of family pathology, a higher incidence of learning disabilities, and a higher incidence of hyperactivity. It was concluded that profiles that meet the ADJ greater than or equal to 84T criterion reflect psychopathology, not faking.

Affective Symptoms↗
PubMed2003

The current role of post-conviction sex offender polygraph testing in sex offender treatment.

Polygraph testing is becoming increasingly important in sex offender treatment. Polygraph advocates cite dramatic increases in historical disclosures that presumably allow more precise targeting of treatment interventions, earlier detection of risky behaviors that often lead to new offenses, and improved treatment and supervision compliance. Based on this, they believe the procedure supports desirable behavior that continues to various degrees after treatment and supervision end. Opponents cite ethical problems related to inaccurate results, unproven accuracy rates, and the risk that examinees may be coerced into making false admissions. To counter these criticisms, proponents have developed standards, best practices, and examiner training and certification programs intended to reduce error rates and address ethical issues. Opponents argue that these measures have not been tested and that empirically established error rates and best practices may not be possible for a variety of reasons. This article reviews the current situation, leaving readers to decide the wisdom and ethics of using polygraph testing in their own practices.

Criminal Law↗
PubMed1998

P300 correlates of simulated malingered amnesia in a matching-to-sample task: topographic analyses of deception versus truthtelling responses.

Two experiments using a P300-enhanced Forced Choice Procedure (P3FCP) investigated simulated amnesia in a matching-to-sample task. In Experiment 1, successful manipulation of subjects towards different behavioral hit rates (75-80% vs. 85-90%) did not adversely affect the diagnostic sensitivity of match-mismatch Pz-P300 amplitude analyses, allowing detection of 69% of simulators. P300 amplitudes of simulators (Malinger group) were as large as those of truth-tellers (truth group, a control), indicating no dual task-related (Malingering) reduction across different behavioral hit rates. Experiment 2 found no main effect of oddball type, match vs. mismatch, on P300 (P3) amplitude with a mismatch-rare variant of the P3FCP. This study also revealed larger Pz-P3s in the Malingering (vs. Truth-telling) condition. Subsequent topographic analyses suggested different Truth and Malinger scaled P3 amplitude topographies in both these sets of P3FCP data and in those from a previous autobiographical memory paradigm. Further analysis yielded preliminary evidence for a common deception-related P3 amplitude topography across different paradigms/conditions.

Adult↗
PubMedDate not supplied

Clinical judgment and decision-making in CQT-polygraphy. A comparison with other pseudoscientific applications in psychology.

The control questions technique (CQT) is the most widely used method of psychophysiological detection, in spite of its questionable scientific status and the lack of sufficient empirical basis. The goal of this paper is to account for the tremendous popularity of the CQT, and to present a theory describing how decisions and conclusions are reached within the typical CQT-interrogation process. It is claimed that the examiner starts with an a priori hypothesis derived from background information and from prior interactions with the examinee. The test-specific information is then used to test the a priori hypothesis, but this process is influenced by the confirmation bias. The complexity of the information available to the examiner coupled with the lack of well-defined quantification and integration rules allow the examiner to overweigh confirming evidence and to disregard disconfirming cues. This description may be applicable to several other pseudoscientific methods. The implications of the present theory for CQT polygraphy are discussed and comparisons with other purported applications of psychology are made.

Arousal↗
PubMed2005

P300-based detection of concealed autobiographical versus incidentally acquired information in target and non-target paradigms.

The basic rationale of P300-based tests of concealed information compares responses to critical ('probe') and non-critical ('irrelevant') items. Accuracy, both in the laboratory and the field, is the degree to which responding to probes exceeds that to irrelevants. The present laboratory study assessed the influence of two factors on accuracy. The first, varied between subjects, was whether the paradigm included probes, irrelevants, and target items (as is the case in most P300 preparations), or whether the paradigm included only probe and irrelevant items. The second, orthogonally varied, within-subject factor was whether the probe was an autobiographical item (the subject's name), or incidentally acquired (as in common field applications). Accuracy was greater with the subject's name as probe, perhaps because of the greater potency of autobiographical items than incidentally acquired ones, even when these are learned to a 100% accuracy. On the other hand, contrary to expectations from a work-load interpretation, the removal of the target did not affect accuracy, but rather decreased P300 magnitude to both probes and irrelevants in the non-target group.

Acoustic Stimulation↗
PubMed1998

Efficacy of repeated psychophysiological detection of deception testing.

Physiological measures were recorded during repeated psychophysiological detection of deception (PDD) tests to determine if reaction levels change with test repetition. Two groups of 22 healthy male subjects completed six peak of tension PDD tests on each of two test days. A minimum between test day interval of six days was maintained. The treatment group was programmed to respond deceptively to one of seven test questions while the control group was programmed to respond truthfully to all questions. The respiration and galvanic skin resistance (GSR) line lengths, GSR peak response amplitude and latency, and cardiovascular inter-beat-interval (IBI) were calculated for each response. Analyses indicated that, except for GSR peak response latency, differential physiological reactivity during a PDD test did not change significantly over repeated tests or days; there was a decrease in average respiration line lengths at the initial test(s) of each day; and differential changes in average respiration line length, GSR peak latency, and cardiovascular IBI responses corresponded to deception. Power analyses were calculated to assist in result interpretation. It is suggested that PDD decision accuracy, concerning subject veracity, should not decrease during repeated testing.

Adult↗
PubMed2001

Using brain MERMER testing to detect knowledge despite efforts to conceal.

This experiment examined the accuracy and reliability of the memory and encoding related multifaceted electroencephalographic response (MERMER) technique for detecting information related to events subjects have experienced, despite subjects' efforts to conceal that knowledge. Information obtained through interviews was used to develop stimulus sets consisting of words and phrases presented to subjects visually by computer. Sets were composed of three types of stimuli: life experience-related (Probes), stimuli the subject was asked to memorize and respond to (Targets), and irrelevant information (Irrelevants). Each set of stimuli was tested on two individuals: (1) one individual who had participated in the event in question--and thus had the relevant information stored in his/her brain, and (2) one who had not. Six subjects were tested. Electrical brain responses to the stimuli were recorded non-invasively from the scalp and analyzed. MERMERs, (memory and encoding related multifaceted electroencephalographic responses), of which the P300 is a sub-component, were used to determine whether the subject had the relevant information stored in his brain (information present) or not (information absent), thus indicating whether or not each subject had participated in the real-life event in question. Bootstrapping was used to analyze and compare the responses to the three types of stimuli. As predicted, MERMERs were elicited by Probe stimuli only in the subjects who had participated in the investigated event, by Target stimuli in all subjects, and in no case by Irrelevant stimuli. For each of the six subjects, brain MERMER testing correctly determined whether the subject had participated in and consequently knew about the event in question (information present) or had not participated (information absent). The statistical confidence for this determination was 99.9% in five cases and 90.0% in one case. The article concludes with a discussion of areas of future research and the potential for using this new technology as an investigative tool in criminal cases.

Adult↗
PubMed1991

Quantitative automated latex nephelometric immunoassay for determination of myoglobin in human serum.

We have evaluated a new latex nephelometric test for the quantitation of myoglobin in human serum. The assay consists of incubating the diluted serum sample (20-fold) for 12 min at room temperature with latex particles covalently coated with anti-myoglobin antibodies and then quantifying the change of light-scatter produced. The assay is fully automated on the Behring nephelometer analyzer with a sampling rate of 150 samples/hour. There is no interference from bilirubin (up to 340 mumol/l), haemoglobin (up to 7,000 mg/l), or rheumatoid factor (up to 1,100 int. units/ml). Myoglobin standard curve extends from 20 to 380 micrograms/l. Assay detection limit lies around 6 micrograms/l. Coefficient of variation ranged from 2.7 to 7.6%. Correlation coefficient between latex immunoassay and an RIA method was 0.987, calculated from the assay of 37 samples. A statistically significant difference was found between the distribution for females and males. The serum level of myoglobin showed an age-dependent variation. Concentrations up to 60 micrograms/l are considered to be normal.

Adolescent↗
PubMed1994

Fluorescence postlabeling assay of RNA modification.

A new approach has been developed to assay RNA modification by combining enzymatic digestion of RNA to nucleoside monophosphate and fluorescence postlabeling. Nuclease P1 digestion of modified RNA affords both normal and modified nucleotides. The nucleotides are labeled in-situ with dansyl chloride via phosphoramidate derivatives with ethylenediamine following a procedure initially designed to synthesize fluorescence labeled deoxynucleotides. The postlabeled nucleotides are analyzed by HPLC using a fluorescence detector. Fluorescence postlabeling assay of 7-methylGmp in RNA exposed to dimethyl sulfate has validated the technique. In the presence of excess normal nucleotides, the limit of detection (LOD) lies between normal to modified nucleotide ratio of 10(3) to 10(4). HPLC enrichment of the modified nucleotide from the normal nucleotides prior to labeling enhances the LOD by two orders of magnitude.

Chromatography, High Pressure Liquid↗
PubMed1981

Occupational exposure to hexachlorocyclohexane. V. Gas chromatographic determination of monohydroxychlorobenzenes (chlorophenols) in urine.

A sensitive and specific gas chromatographic method is described for the simultaneous determination of ten chlorinated phenols that appear in the urine of persons exposed to hexachlorocyclohexane (HCH). The phenolic compounds in the urinary samples are hydrolysed in an acidic medium and derivatised with acetic anhydride. This sample treatment permits routine application. The stationary phase (8% DC 200 on Chromosorb G AW-DMCS) possesses a high separating capability for the acetic esters of the chlorophenols. The detection limits lie between 4.9 and 18.6 micrograms/l and allow determinations even in the environmentally interesting concentration range. The recoveries determined using aqueous standards range between 87 and 119% and the relative standard deviations are between 4.4 and 10.1%.

Chlorophenols↗