Stress and Deception in Speech: Evaluating Layered Voice Analysis*

Abstract: This study was designed to evaluate commonly used voice stress analyzers—in this case the layered voice analysis (LVA) system. The research protocol involved the use of a speech database containing materials recorded while highly controlled deception and stress levels were systematically varied. Subjects were 24 each males/females (age range 18–63 years) drawn from a diverse population. All held strong views about some issue; they were required to make intense contradictory statements while believing that they would be heard/seen by peers. The LVA system was then evaluated by means of a double blind study using two types of examiners: a pair of scientists trained and certified by the manufacturer in the proper use of the system and two highly experienced LVA instructors provided by this same firm. The results showed that the “true positive” (or hit) rates for all examiners averaged near chance (42–56%) for all conditions, types of materials (e.g., stress vs. unstressed, truth vs. deception), and examiners (scientists vs. manufacturers). Most importantly, the false positive rate was very high, ranging from 40% to 65%. Sensitivity statistics confirmed that the LVA system operated at about chance levels in the detection of truth, deception, and the presence of high and low vocal stress states.     

The effect of participation in a conversation on recognition and identification of the speakers' voices

Subjects' recognition of their own voice, the voice of a person they had a conversation with, and the voices of two people they heard converse, were compared. They listened to or conversed with each voice for five minutes and then attempted to recognize each voice from among 26 voices saying the same test phrase. In general, subjects recognized the voice of their conversational partner better than the voices of people they had listened to passively. They did not recognize their own voice better than that of their partner. Subjects who recognized their own voice always identified it without error. Although subjects correctly identified other voices they correctly recognized, they also falsely identified voices they falsely recognized. These results are discussed with respect to their practical implications for voice identification by witnesses in legal proceedings and with respect to current theories of memory.     

Do Prophylactics Prevent Inflation? Post-identification Feedback and the Effectiveness of Procedures to Protect Against Confidence-inflation in Earwitnesses

After viewing or hearing a recorded simulated crime, participants were asked to identify the offender’s voice from a target-absent audio lineup. After making their voice identification, some participants were either given confirming feedback or no feedback. The feedback manipulation in experiment 1 led to higher ratings of participants’ identification certainty, as well as higher ratings on retrospective confidence reports, in both the immediate and delay groups. Earwitnesses who were asked about their identification certainty prior to the feedback manipulation (experiment 2) did not demonstrate the typical confidence-inflation associated with confirming feedback if they were questioned about the witnessing experience immediately; however, the effects returned after a week-long retention interval. The implications for the differential forgetting and internal-cues hypotheses are discussed.     

Real Personal Uncertainty Induced by Means of Task-Related Feedback: Effects on Reactions to Voice and No-Voice Procedures

Building and extending on research on uncertainty management and voice and no-voice procedures, we examine how real personal uncertainty moderates the way in which people react to getting or being denied an opportunity to voice one??s opinions about decisions to be made. Specifically, results of two experiments show that conditions in which participants receive task-related feedback that induces personal uncertainty (versus conditions that produce more personal certainty) lead to stronger effects of voice and especially no-voice procedures on participants?? procedural fairness judgments (Experiments 1 and 2). Findings also reveal that in these conditions stronger effects of voice and particularly no-voice procedures can be found on participants?? anger about the way they have been treated, especially when participants are predisposed to react in intense terms to affect-related events (Experiment 2). Implications for the literature on uncertainty management and the social psychology of voice and no-voice procedures are discussed.     

A triad of laryngeal hemorrhages in strangulation: a report of eight cases

The results of histological studies on larynges from eight cases of manual strangulation, all that had intracartilaginous laryngeal hemorrhages, a recently described and under-recognized lesion associated with strangulation, are reported. Formalin-fixed larynges were examined in serial section using a standardized protocol. In all cases, intracartilaginous laryngeal hemorrhages were associated with subepithelial laryngeal hemorrhages, and intralaryngeal muscular hemorrhages forming a "triad of hemorrhages." In five cases, the triad was found in the presence of laryngeal cartilage microfractures. Since cartilage microfractures can be causally related to mechanical injury to the neck, it is likely that the triad of hemorrhages has diagnostic value as an independent morphological criterion for the postmortem diagnosis of strangulation. Since a proportion of cases of strangulation lack characteristics that are self-evidently due to violent application of pressure on the neck, recognition of the triad may have important implications for the postmortem diagnosis of strangulation.     

Procedural decisions in intergroup conflict situations: The influence of hierarchical group membership

A review of research on procedural and distributive justice shows that whereas distributive justice research has examined people's actual choice of outcomes, procedural justice research has paid little attention to the investigation of people's actual choice of procedures. In the present paper, three experiments are presented, all investigating people's actual choice of procedures. In all three experiments, participants were in a middle-management position where their subordinates demanded an opportunity to voice their opinion, while their superiors demanded that the subordinates should not be allowed voice. In Experiments 1 and 2 it was found that participants who were induced to identify with the low hierarchical group (subordinates) allowed more voice than participants who were induced to identify with the high hierarchical group (superiors), but that the effect of hierarchical group membership was absent when maximizing performance (Experiment 1) or participative values (Experiment 2) were explicitly emphasized. In Experiment 3 it was found that the effect of hierarchical group membership on procedural decision making was also evident in persons who progressed from identifying with both hierarchical groups to identifying with one hierarchical group. In the discussion it is argued that cross-fertilization between the fields of procedural and distributive justice will deepen our understanding of social justice in general.     

Correlates of subjective stress among drug court clients

Psychosocial stress is consistently found to promote initiation, intensification, and relapse in drug abuse. It would, therefore, be desirable to identify characteristics of offenders who are at heightened risk for stress-induced exacerbations of addictive behavior. In this cross-sectional, correlational, interview study, 500 clients of two Kentucky drug courts averaged 30 years of age and were predominantly male, White, employed, high school educated, single, and adjudicated in small- and medium-size cities. Five independent correlates of greater subjective stress emerged in stepwise multiple regression analysis (R2 = .395): use of escape-avoidance coping, positive reappraisal coping (inversely associated), more negative life events, better self-rated health (inversely associated), and access to social support related to work problems (inversely associated). Treatment interventions emphasizing effective coping styles and building of social support as well as managing of negative life events and perceptions of health may serve to lessen subjective stress and its consequences in drug-abusing criminal populations.     

You've been warned: Consumer liability in Internet banking fraud

This contribution provides a critical analysis of the treatment of consumer liability in cases of Internet banking fraud. Whereas generally banks refund the financial losses associated with Internet banking fraud to the individual victim, exceptions do occur, at least in certain EU jurisdictions. These, however, are rarely spoken about, but do indicate a number of (legal) problems. The main problems are lack of clarity and lack of consistency as to when a consumer can be held liable. These problems also maintain potential negative consequences such as increase in perceived risk, loss of trust and demands for better security, which may be suboptimal from an economical perspective. This article concludes by reflecting on the potential benefits of the introduction of zero liability as an alternative.     

Forensic analysis of Telegram Messenger on Android smartphones

In this paper we present a methodology for the forensic analysis of the artifacts generated on Android smartphones by Telegram Messenger, the official client for the Telegram instant messaging platform, which provides various forms of secure individual and group communication, by means of which both textual and non-textual messages can be exchanged among users, as well as voice calls.Our methodology is based on the design of a set of experiments suitable to elicit the generation of artifacts and their retention on the device storage, and on the use of virtualized smartphones to ensure the generality of the results and the full repeatability of the experiments, so that our findings can be reproduced and validated by a third-party.In this paper we show that, by using the proposed methodology, we are able (a) to identify all the artifacts generated by Telegram Messenger, (b) to decode and interpret each one of them, and (c) to correlate them in order to infer various types of information that cannot be obtained by considering each one of them in isolation.As a result, in this paper we show how to reconstruct the list of contacts, the chronology and contents of the messages that have been exchanged by users, as well as the contents of files that have been sent or received. Furthermore, we show how to determine significant properties of the various chats, groups, and channels in which the user has been involved (e.g., the identifier of the creator, the date of creation, the date of joining, etc.). Finally, we show how to reconstruct the log of the voice calls made or received by the user.Although in this paper we focus on Telegram Messenger, our methodology can be applied to the forensic analysis of any application running on the Android platform.     

A metallurgical review of the interpretation of bullet lead compositional analysis

Comparison of the minor and trace element compositions of bullet lead alloys has been used by some forensic examiners to make definitive positive associations between bullets or lead fragments at a crime scene and samples of bullets linked to a suspect(s). Such conclusions have been based on the elemental analysis of isolated groups of bullets with no consideration of the metallurgical processes involved in the production and refining of the bullet lead alloys. An understanding of the metallurgy of lead refining reveals that the elements quantified in the forensic analysis are carefully controlled in the refining process and that there are logical reasons why some elements are more discriminatory than others. Data for lead alloys supplied to two major ammunition manufacturers confirm that multiple indistinguishable shipments of lead alloys from secondary lead refiners to the ammunition manufacturers are made each year and over a period of many years. The data also demonstrate that distinguishable compositions can come from the same melt or "source" of lead alloy. These results clearly indicate that bullets with indistinguishable compositions could have come from different lead "sources" produced in the same or different years. Furthermore, the observation that two bullets have a distinguishable composition does not necessarily mean that they came from a different "source".Our results show that the forensic examiner using a method of bullet lead alloy elemental analysis, which quantifies up to six elements is restricted to concluding only that indistinguishable bullets might have come from the same "source," not that they did come from the same "source". In addition, it is quite possible that multiple bullets with similar but distinguishable compositions could have come from the same "source". The authors therefore feel that there is no scientific validity to any conclusions more positive than attributing the possible association as to molten source among bullets from different samples. An understanding of the metallurgical principles operative in the melting/casting process as well as the data acquired for this study, indicate that any forensic conclusions which associate unknown bullets with the "same source", and/or "same box" should fail most or all Daubert criteria.     

法庭语音学

本文对法庭语音学进行了研究综述,主要介绍了该学科的核心内容：说话人鉴定。在实际办案中,当未找到嫌疑人,只有犯罪分子的检材语音时,可以使用说话人画像/说话人分类技术。若没有犯罪分子的录音证据时,可以让受害人和证人进行说话人的听觉辨认。具体的辨认形式有两种：对熟人辨认和对陌生人辨认,在对陌生人辨认时可以采用语音辨认的方法进行。当检材语音和样本语音都齐备的时候,法庭语音分析专家就可以对二者进行比对检验了。目前语音比对分析涉及到的问题和领域有：基于贝叶斯方法的法庭推理和似然比计算、共振峰频率的测量应用、非解析感知与样例理论、法庭说话人自动识别以及不同方法的综合应用等。     

Hearing Voice: A Theoretical Framework for Truth Commission Testimony

The article proposes a new way of thinking through truth commissions by discerning the manner in which they usher in new political configurations through voices and vocalizations. It contributes to our understanding of truth commissions by way of proposing a pragmatic ontology of bonds between the body, voice, and testimony by elucidating the central features that make them vocal assemblages, composed of five sub-institutional capacities: (1) they affect and are affected by bodies in a complex topological relation; (2) they are driven by an apology, which itself proffers a non-human body of transformation; (3) they potentiate reconciliation through spontaneous vocalizations; (4) they are ontogenetic openings that reassemble national pasts, presents, and futures; and (5) they are temporally experiential predecessors to political action. While victim testimony is taken as a historical crowning of the edifice for nations seeking to mend their past injustices, I contend that public reparation flourishes only if the state is open to the alternative orientations the voice proffers—that is, following recent observations of transitional justice, truth commissions have the potential to seek out alternative context-specific forms of justice in place of a universal law of reconciliation. By way of a brief discussion of Aboriginal artist K.C. Adams’ diptych series, Perception, the article proposes that voices pose a nuanced figuration of auto-affection as a communicative possibility towards the (re)presentation and (re)invention of the (survivor) self.     

Visualizing Lives: New Pathways for Analyzing Life Course Trajectories

The goal of statistical analysis is to find patterns in data. Most statistical methods rely on analyzing the effect of the same set of variables on the population under study, i.e., nomothetic analysis. Therefore, when data are collected in the social sciences, most often they are put in a framework that resembles a spreadsheet: each row represents a separate individual, and each column represents a separate characteristic (or variable) that pertains to that individual.However, not all individuals in the study are affected by the same set of variables: each individual may have his/her own individual set of relevant variables, suggesting that methods be developed that consider them individually, i.e., idiographic analysis. Moreover, lives are lived chronologically, and are often best described in narrative form. These narratives usually have to be condensed, or abridged in other ways, in order to fit the data framework and permit what one might call ``algorithmic analysis. Each set of methods has its advantage: nomothetic methods generate general laws that apply to all, while idiographic methods trace the putative causal relationships that are unique to each individual.This paper describes another data collection and analytic framework, one that (a) is chronological; (b) recognizes that different people may have experienced entirely different events and thus may need different ``variables to understand their behavior; (c) recognizes that, even if people experience similar events, they may have entirely different reactions to them; and (d) can be studied (and patterns inferred) using an exploratory graphical analysis that is more free-form than algorithmic analysis. Examples of this type of analysis used in different medical and criminal justice contexts are given, and suggested directions of research in this area are described.     

Evaluation of methyl tert-butyl ether (MTBE) as an interference on commercial breath-alcohol analyzers.

Anecdotal reports suggest that high environmental or occupational exposures to the fuel oxygenate methyl tert-butyl ether (MTBE) may result in breath concentrations that are sufficiently elevated to cause a false positive on commercial breath-alcohol analyzers. We evaluated this possibility in vitro by establishing a response curve for simulated breath containing MTBE in ethanol. Two types of breath-alcohol analyzers were evaluated. One analyzer's principle of operation involves in situ wet chemistry (oxidation of ethanol in a potassium dichromate solution) and absorption of visible light. The second instrument uses a combination of infrared absorption and an electrochemical sensor. Both types of instruments are currently used, although the former method represents older technology while the latter method represents newer technology.The percent blood alcohol response curve was evaluated over a breath concentration range thought to be relevant to high-level environmental or occupational exposure (0-361 microg/l). Results indicate that MTBE positively biases the response of the older technology Breathalyzer when evaluated as a single constituent or in combination with ethanol. We conclude that a false positive is possible on this instrument if the MTBE exposure is very high, recent with respect to testing, and occurs in combination with ethanol consumption. The interference can be identified on the older technology instrument by a time dependent post-reading increase in the instrument response that does not occur for ethanol alone. In contrast, the newer technology instrument using infrared and electrochemical detectors did not respond to MTBE at lower levels (0-36 microg/l), and at higher levels (>72 microg/l) the instrument indicated an "interference" or "error". For this instrument, a false positive does not occur even at high MTBE levels in the presence of ethanol.     

Whither Suffering? The Potential Impact of Tort Reform on the Emotional and Existential Healing of Traumatically Injured Chronic Pain Patients

Approximately half of the state legislatures in the USA have enacted tort reform, generally focused on reducing noneconomic damages such as those awarded for pain and suffering of traumatically injured parties. Traumatic injury has been empirically associated with the development of chronic pain, which in turn has been associated with the concept of human suffering. This analysis examines the meaning of suffering within the context of traumatically induced chronic pain, recognizing that this population is at heightened risk of experiencing long-term emotional as well as physical pain. Factors contributing to profound suffering include the potential development of post-traumatic stress disorder, depression and anxiety, role/identity loss, maltreatment by a medical system generally inept in its management of chronic pain, and the negative manner in which personal injury victims are often treated by the legal system. While the American medical system struggles to identify suffering, the legal system—through tort reform—has chosen to simply ignore it, demonstrating little concern for the integrity of the vulnerable chronic pain sufferer. In doing so, the “destructed” chronic painient is further “deconstructed”. We argue that by limiting the size of settlements and jury awards, tort reform serves to potentially deny personal injury victims of a critical vehicle for finding meaning in their suffering, and accordingly limits their likelihood of achieving relief.     

Decapitation as a result of suicidal hanging

A report is presented on a 47 year old man who committed suicide by hanging himself from a staircase bannister of an apartment house. The man, weighing 144 kg jumped with the noose of a 2 cm thick and 2 m long hemp rope around his neck and was completely decapitated. Death from typical "normal" suicidal hanging is usually due to cerebral ischaemia caused by compression of the carotid (and vertebral) arteries. Except for bleeding at the clavicular insertions of the sternocleidomastoid muscles there are only occasional injuries to the cervical soft parts or hyoid bone and/or laryngeal cartilage. A fall with a noose around the neck, on the other hand, is associated with more frequent injuries to cervical structures through additional axial traction and radial shearing forces of the tightening noose. Complete decapitation can occur in rare cases under extreme conditions (heavy body weight, inelastic and/or thin rope material, fall from a great height).     

Does the Use of Voice Lie Detection Equipment in the United Kingdom Breach Article 8 of the European Convention on Human Rights and the Equality Act 2010?

Separating truth from lies has long been the goal of the legal system. Unfortunately, determining what is true is as difficult as it is important. Despite the view held by most people that they are able to tell when being lied to, the reality is that humans are very poor lie detectors. In an effort to overcome this fundamental flaw in human abilities, we have turned to technology to fill the gap. One of the many available technologies relies on the computer analysis of the voice of the statement maker. This technique is said by some to be able to highlight features in the voice of the speaker which indicate a high risk that they are not telling the truth. Whether or not the technology works, and the legal and ethical implications of such a finding, are beyond the scope of this paper. Rather, this paper assumes that the system achieves its stated aim, and examines the implications of the use of such devices on the public in terms of Human Rights and the provisions of the Equality Act 2010.     

“I didn’t do it,but if I did I had a good reason”: Minimization,Denial, and Attributions of Blame Among Male and Female Domestic Violence Offenders

Women are increasingly being arrested and prosecuted for assaulting an intimate partner. Whereas extensive research has been conducted to identify the treatment needs of male domestic violence offenders, few studies have examined females convicted of the same charges. In the present study 1,267 men and 159 women convicted of intimate partner abuse were compared on scales assessing attributions of blame for their recent offense, minimization, denial, and socially desirable responding. Research with male offenders has identified these factors as important treatment targets, as they appear to influence an offenders risk for noncompliance and recidivism. The results of the study suggest that both male and female domestic violence offenders engage in socially desirable responding during court-ordered evaluations, that both attribute greater blame for the recent offense to their spouse/partner than they acknowledge for themselves, and that significant numbers of both genders deny the recent incident and/or minimize the severity of the offense. Areas for further research are highlighted along with a discussion of the implications of these findings for practitioners.