Evaluating the utility of hexapod species for calculating a confidence interval about a succession based postmortem interval estimate

Perez, Anne E.; Haskell, Neal H.; Wells, Jeffrey D.

doi:10.1016/j.forsciint.2014.05.007

Cited by 38 publications

(24 citation statements)

References 35 publications

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“…Most previous successional approaches for PMI used adult insects as primary indicators [9, 17, 52]. The inclusion of adult insects may be, however, problematic for two reasons.…”

Section: Discussionmentioning

confidence: 99%

“…Although there are good quantitative indicators, for example, cadaver temperature [2], potassium content in vitreous humor [3], or the length of carrion insect larvae [4, 5], many markers are qualitative, for example, species/life stages of insects or bacteria successively occurring on cadavers [6–9] or markers related to soft tissue decomposition [10, 11]. As a rule, qualitative markers persist for some time, and the persistence times of different markers usually largely overlap.…”

Section: Introductionmentioning

confidence: 99%

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A general approach for postmortem interval based on uniformly distributed and interconnected qualitative indicators

Matuszewski

2017

Int J Legal Med

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There are many qualitative indicators for postmortem interval (PMI) of human or animal cadavers. When such indicators are uniformly spaced over PMI, the resultant distribution may be very useful for the estimation of PMI. Existing methods of estimation rely on indicator persistence time that is, however, difficult to estimate because of its dependence on many interacting factors, of which forensic scientists are usually unaware in casework. In this article, an approach is developed for the estimation of PMI from qualitative markers in which indicator persistence time is not used. The method involves the estimation of an interval preceding appearance of a marker on cadaver called the pre-appearance interval (PAI). PMI is delineated by PAI for two consecutive markers: the one being recorded on the cadaver (defining lower PMI) and the other that is next along the PMI timeline but yet absent on the cadaver (defining upper PMI). The approach was calibrated for use with subsequent life stages of carrion insects and tested using results of pig cadaver experiments. Results demonstrate that the presence and absence of the subsequent developmental stages of carrion insects, coupled with the estimation of their PAI, gives a reliable and easily accessible knowledge of PMI in a forensic context.Electronic supplementary materialThe online version of this article (doi:10.1007/s00414-016-1520-3) contains supplementary material, which is available to authorized users.

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“…Most previous successional approaches for PMI used adult insects as primary indicators [9, 17, 52]. The inclusion of adult insects may be, however, problematic for two reasons.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A general approach for postmortem interval based on uniformly distributed and interconnected qualitative indicators

Matuszewski

2017

Int J Legal Med

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“…The original application was to estimate S.I. [5], but the same procedure can be used to predict insect age from stage of development.…”

Section: Lesson 2: Exceed the Minimum Sample Size For A Categoricamentioning

confidence: 99%

“…The two familiar entomological postmortem clocks are the development of an individual insect and the succession of species on a corpse [2], and both processes may potentially be influenced by many factors [3]. Depending on the circumstances, the investigator may interpret a prediction of insect age or time a corpse was available to insects as the actual postmortem interval (PMI) or a minimum PMI (PMI min ) [4,5]. …”

Section: Introductionmentioning

confidence: 99%

“…[5]) as a condition , any other factor that influences development or succession rate (e.g., temperature) as a covariate , and that aspect(s) of a specimen or insect community that changes with time (e.g., larval length or species present on a corpse) as a response . Scientists concerned with PMI estimation try to understand (e.g., model) the condition/response relationship so as to be able to infer condition from response.…”

Section: Introductionmentioning

confidence: 99%

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The Role of a PMI-Prediction Model in Evaluating Forensic Entomology Experimental Design, the Importance of Covariates, and the Utility of Response Variables for Estimating Time Since Death

Wells

LaMotte

2017

Insects

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The most common forensic entomological application is the estimation of some portion of the time since death, or postmortem interval (PMI). To our knowledge, a PMI estimate is almost never accompanied by an associated probability. Statistical methods are now available for calculating confidence limits for an insect-based prediction of PMI for both succession and development data. In addition to it now being possible to employ these approaches in validation experiments and casework, it is also now possible to use the criterion of prediction performance to guide training experiments, i.e., to modify carrion insect development or succession experiment design in ways likely to improve the performance of PMI predictions using the resulting data. In this paper, we provide examples, derived from our research program on calculating PMI estimate probabilities, of how training data experiment design can influence the performance of a statistical model for PMI prediction.

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A review of the Forensic Entomology literature in the midwestern United States

Hans

Yoho

Robbins

et al. 2021

WIREs Forensic Science

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A review of literature pertaining to forensic entomology in the midwestern region of the United States was conducted, searching for the earliest articles up through publications from early 2020. Eight states are included in this region, containing a total of 161 publications. There were a large number of publications regarding biodiversity, insect arrival and colonization of carrion. While Illinois had the greatest number of publications with more than 40, Minnesota produced the fewest publications, with only five. This review highlights the need for further investigations in forensic entomology in this region of the United States. This article is categorized under: Forensic Anthropology > Time Since Death Estimation Crime Scene Investigation > Crime Scene Examination Forensic Biology > Forensic Entomology

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Evaluating the utility of hexapod species for calculating a confidence interval about a succession based postmortem interval estimate

Cited by 38 publications

References 35 publications

A general approach for postmortem interval based on uniformly distributed and interconnected qualitative indicators

A general approach for postmortem interval based on uniformly distributed and interconnected qualitative indicators

The Role of a PMI-Prediction Model in Evaluating Forensic Entomology Experimental Design, the Importance of Covariates, and the Utility of Response Variables for Estimating Time Since Death

A review of the Forensic Entomology literature in the midwestern United States

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