Trial by Numbers

This is the final version of the article. Freely available from the publisher via the link in this record.Legal cases often require jurors to use numerical information. They may need to evaluate the meaning of specific numbers, such as the probability of match between a suspect and a DNA sample, or they may need to arrive at a sound numerical judgment, such as a money damage award. Thus, it is important to know how jurors understand numerical information, and what steps can be taken to increase juror comprehension and appropriate application of numerical evidence. In this Article, we examine two types of juror decisions involving numbers––decisions in which jurors must convert numbers into meaning (such as by understanding numerical evidence in order to determine guilt or liability), and decisions in which jurors must convert meaning into numbers (such as by understanding qualitative evidence and converting this into a numerical damage award amount). In each of these areas we analyze legal cases and research to examine areas in which dealing with numbers leads to sound or sub-optimal decision making in jurors. We then examine psychological theory and research on numerical decision making to understand how informed, fair, and consistent juror decision making about numbers can be promoted. We conclude that what is often most important is juror understanding of the meaning of numbers in context rather than technically precise numerical ability, supporting the role of the lay jury. We also suggest how to improve juror understanding, so that jury decisions better reflect considered community judgment.Preparation of this Article was supported in part by the Martha E. Foulk Fellowship awarded to Rebecca K. Helm, by National Science Foundation award SES-1536238: “Quantitative Judgments in Law: Studies of Damage Award Decision Making” to Valerie P. Hans and Valerie F. Reyna, by a grant from Cornell University’s Institute for Social Sciences to Valerie P. Hans and Valerie F. Reyna, and by National Institute of Health (National Institute of Nursing Research) award RO1NR014368-01 to Valerie F. Reyna

From Meaning to Money: Translating Injury Into Dollars

This is the author accepted manuscript. The final version is available from the American Psychological Association via the DOI in this record.Legal systems often require the translation of qualitative assessments into quantitative judgments, yet the qualitative-to-quantitative conversion is a challenging, understudied process. We conducted an experimental test of predictions from a new theory of juror damage award decision making, examining how 154 lay people engaged in the translation process in recommending money damages for pain and suffering in a personal injury tort case. The experiment varied the presence, size, and meaningfulness of an anchor number to determine how these factors influenced monetary award judgments, perceived difficulty, and subjective meaningfulness of awards. As predicted, variability in awards was high, with awards participants considered to be “medium” (rather than “low” or “high”) having the most dispersion. The gist of awards as low, medium, or high fully mediated the relationship between perceived pain/suffering and award amount. Moreover, controlling for participants’ perceptions of plaintiffs and defendants, as well as their desire to punish and to take economic losses into account, meaningful anchors predicted unique variance in award judgments: A meaningful large anchor number drove awards up and a meaningful small anchor drove them down, whereas meaningless large and small anchors did not differ significantly. Numeracy did not predict award magnitudes or variability, but surprisingly, more numerate participants reported that it was more difficult to pick an exact figure to compensate the plaintiff for pain and suffering. The results support predictions of the theory about qualitative gist and meaningful anchors, and suggest that we can assist jurors to arrive at damage awards by providing meaningful numbers.Preparation of this article was funded by National Science Foundation grant SES1536238: “Quantitative Judgments in Law: Studies of Damage Award Decision Making” to Valerie P. Hans and Valerie F. Reyna

Guiding Jurors’ Damage Award Decisions: Experimental Investigations of Approaches Based on Theory and Practice

This is the author accepted manuscript. The final version is available from the American Psychological Association via the DOI in this recordTheory and practitioner “scaling” advice informed hypotheses that guidance to mock jurors should (a) increase validity (vertical equity), decrease variability (reliability), and improve coherence in awards; (b) improve subjective experience of jurors’ decision-making (rated helpfulness, confidence, and difficulty); and (c) have the greatest impact when it includes both verbal and numerical benchmarks. Three mock juror experiments (N = 197 students, N = 476 Amazon Mechanical Turk workers, and N = 391 students) tested novel scaling approaches and predictions from the Hans-Reyna model of damage award decision-making. Jurors reviewed a legal case and provided a dollar award to compensate plaintiffs for pain and suffering following concussions. Experiments varied injury severity (low vs. high) and the plaintiff attorney’s guidance (no guidance, verbal guidance, numerical guidance, and verbal-plus-numerical guidance) between subjects. Results support predictions that, even without guidance, mock jurors appropriately categorize the gist of injuries as low or high severity, and dollar awards reflect that gist. Participants gave a higher award for more severe injuries, indicating that they extracted the qualitative gist of damages. Also, as expected, guidance, particularly verbal-plus-numerical guidance, had beneficial effects on jurors’ subjective experience, with participants reporting that it was a helpful aid in decision-making. Numerical guidance, both with and without verbal guidance, reduced award variability in severe injury cases in all three experiments. Scaling guidance did not improve the already strong gist-verbatim correspondence or award validity. Both grasping the gist of damages and mapping that gist onto numbers are important, but jurors appear to benefit from assistance with numerical mapping

Jury Systems Around the World

Lay citizens participate as decision makers in the legal systems of many countries. This review describes the different approaches that countries employ to integrate lay decision makers, contrasting in particular the use of juries composed of all citizens with mixed decision-making bodies of lay and law-trained judges. The review discusses research on the benefits and drawbacks of lay legal decision making as well as international support for the use of ordinary citizens as legal decision makers, with an eye to explaining a recent increase in new jury systems around the world. The review calls for more comparative work on diverse approaches to lay participation, examining how different methods of including lay participation promote or detract from fact finding, legal consciousness, civic engagement, and citizen power

Evaluating Depressive Symptoms in Schizophrenia: A Psychometric Comparison of the Calgary Depression Scale for Schizophrenia and the Hamilton Depression Rating Scale

Background: The aim of this study was to compare two measures of depression in patients with schizophrenia and schizophrenia spectrum disorder, including patients with delusional and schizoaffective disorder, to conclude implications for their application. Sampling and Methods: A total of 278 patients were assessed using the Calgary Depression Scale for Schizophrenia (CDSS) and the Hamilton Depression Rating Scale (HAMD-17). The Positive and Negative Syndrome Scale (PANSS) was also applied. At admission and discharge, a principal component analysis was performed with each depression scale. The two depression rating scales were furthermore compared using correlation and regression analyses. Results: Three factors were revealed for the CDSS and HAMD-17 factor component analysis. A very similar item loading was found for the CDSS at admission and discharge, whereas results of the loadings of the HAMD-17 items were less stable. The first two factors of the CDSS revealed correlations with positive, negative and general psychopathology. In contrast, multiple significant correlations were found for the HAMD-17 factors and the PANSS sub-scores. Multiple regression analyses demonstrated that the HAMD-17 accounted more for the positive and negative symptom domains than the CDSS. Conclusions:The present results suggest that compared to the HAMD-17, the CDSS is a more specific instrument to measure depressive symptoms in schizophrenia and schizophrenia spectrum disorder, especially in acutely ill patients. Copyright (c) 2012 S. Karger AG, Base

Efficient and Specific Analysis of Red Blood Cell Glycerophospholipid Fatty Acid Composition

Red blood cell (RBC) n-3 fatty acid status is related to various health outcomes. Accepted biological markers for the fatty acid status determination are RBC phospholipids, phosphatidylcholine, and phosphatidyletholamine. The analysis of these lipid fractions is demanding and time consuming and total phospholipid n-3 fatty acid levels might be affected by changes of sphingomyelin contents in the RBC membrane during n-3 supplementation. We developed a method for the specific analysis of RBC glycerophospholipids. The application of the new method in a DHA supplementation trial and the comparison to established markers will determine the relevance of RBC GPL as a valid fatty acid status marker in humans. Methyl esters of glycerophospholipid fatty acids are selectively generated by a two step procedure involving methanolic protein precipitation and base-catalysed methyl ester synthesis. RBC GPL solubilisation is facilitated by ultrasound treatment. Fatty acid status in RBC glycerophospholipids and other established markers were evaluated in thirteen subjects participating in a 30 days supplementation trial (510 mg DHA/d). The intra-assay CV for GPL fatty acids ranged from 1.0 to 10.5% and the inter-assay CV from 1.3 to 10.9%. Docosahexaenoic acid supplementation significantly increased the docosahexaenoic acid contents in all analysed lipid fractions. High correlations were observed for most of the mono- and polyunsaturated fatty acids, and for the omega-3 index (r = 0.924) between RBC phospholipids and glycerophospholipids. The analysis of RBC glycerophospholipid fatty acids yields faster, easier and less costly results equivalent to the conventional analysis of RBC total phospholipids

First histological observations on the incorporation of a novel nanocrystalline hydroxyapatite paste OSTIM(® )in human cancellous bone

BACKGROUND: A commercially available nanocrystalline hydroxyapatite paste Ostim(® )has been reported in few recent studies to surpass other synthetic bone substitutes with respect to the observed clinical results. However, the integration of this implantable material has been histologically evaluated only in animal experimental models up to now. This study aimed to evaluate the tissue incorporation of Ostim(® )in human cancellous bone after reconstructive bone surgery for trauma. METHODS: Biopsy specimens from 6 adult patients with a total of 7 tibial, calcaneal or distal radial fractures were obtained at the time of osteosynthesis removal. The median interval from initial operation to tissue sampling was 13 (range 3–15) months. Samples were stained with Masson-Goldner, von Kossa, and toluidine blue. Osteoid volume, trabecular width and bone volume, and cortical porosity were analyzed. Samples were immunolabeled with antibodies against CD68, CD56 and human prolyl 4-hydroxylase to detect macrophages, osteoblasts, and fibroblasts, respectively. TRAP stainings were used to identify osteoclasts. RESULTS: Histomorphometric data indicated good regeneration with normal bone turnover: mean osteoid volume was 1.93% of the trabecular bone mass, trabecular bone volume – 28.4%, trabecular width – 225.12 μm, and porosity index – 2.6%. Cortical and spongious bone tissue were well structured. Neither inflammatory reaction, nor osteofibrosis or osteonecrosis were observed. The implanted material was widely absorbed. CONCLUSION: The studied nanocrystalline hydroxyapatite paste showed good tissue incorporation. It is highly biocompatible and appears to be a suitable bone substitute for juxtaarticular comminuted fractures in combination with a stable screw-plate osteosynthesis

Pulse energy packing effects on material transport during laser processing of < 1

The effects of energy pulse packing on material transport during single-pulse laser processing of silicon is studied using temporarily shaped pulses with durations from 50 to 150 ns. Six regimes of material transport were identified and disambiguated through energy packing considerations over a range of pulse durations. Energy packing has been shown to shift the interaction to energetically costlier regimes without appreciable benefit in either depth, material removal or crater morphology and quality.The authors would like to thank the UK Technology Strategy Board under project TP14/HVM/6/I/BD5665. The authors acknowledge the EPSRC Centre for Doctoral Training in Photonic Systems Development for their generous support