The probative character of Forensic Handwriting Examiners’ identification and elimination opinions on questioned signatures

Found, Bryan; Rogers, Doug

doi:10.1016/j.forsciint.2008.02.001

Cited by 25 publications

(11 citation statements)

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“…FDEs using traditional subjective techniques have consistently been shown to outperform laypersons in determining the authenticity of signatures (15,16). However, a recent report indicates that FDEs may have difficulty discriminating between signatures that are disguised and those that are forged (17). This serves as a focus of the research reported here.…”

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confidence: 99%

The Dynamic Character of Disguise Behavior for Text‐based, Mixed, and Stylized Signatures

Mohammed

Found

Caligiuri

et al. 2010

Journal of Forensic Sciences

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The aims of this study were to determine if dynamic parameters (duration, size, velocity, jerk, and pen pressure) differed for signing style (text-based, stylized, and mixed) and if signing style influences handwriting dynamics equally across three signature conditions (genuine, disguised, and auto-simulation). Ninety writers provided 10 genuine signatures, five disguised signatures, and five auto-simulated signatures. All 1800 signatures were collected using a digitizing tablet resulting in a database of each signature's dynamic characteristics. With genuine signatures, there were significant differences between styles for size, velocity, and pen pressure, and there were significant differences between genuine signatures and at least one of the un-natural signature conditions for all parameters. For velocity and size, these changes with condition were dependent on style. Changes with condition for the other parameters were similar for the three styles. This study shows that there are differences among natural signature styles and disguise behaviors that may be relevant in forensic signature examinations.

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The Dynamic Character of Disguise Behavior for Text‐based, Mixed, and Stylized Signatures

Mohammed

Found

Caligiuri

et al. 2010

Journal of Forensic Sciences

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“…The misleading opinions, in the study reported by Found and Rogers [13] could have arisen from two sources in terms of the cognitive comparison processes. Firstly, the FHEs may have detected that there were dissimilar features associated with the disguise and/or simulated signatures and attributed the dissimilarities to the incorrect writing behaviour (i.e.…”

Section: Introductionmentioning

confidence: 86%

“…The nature of the expertise lies in the significantly lower rate of misleading (erroneous) opinions expressed by FHEs as compared to laypeople. However, recent research has identified some problem areas in FHEs' skill, these being simulated and disguised writing types [13]. These authors show that FHEs are markedly more conservative expressing authorship opinions on questioned disguised and simulated signatures compared with opinions on questioned genuine signatures.…”

Section: Introductionmentioning

confidence: 96%

Forensic handwriting examiners’ opinions on the process of production of disguised and simulated signatures

Bird

Found

Ballantyne³

et al. 2010

Forensic Science International

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“…Já foi publicado na literatura que a distinção entre assinaturas simuladas e disfarçadas representa um problema [9]. Diferenças associadas a uma assinatura questionada disfarçada podem ser atribuídas ao comportamento de simulação e levar à conclusão de que a assinatura não foi feita por esse escritor.…”

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Estudo das características gráficas mais frequentemente alteradas em disfarces de assinaturas

Gorziza

2017

Rev. Bras. Crimin.

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ResumoAssinaturas são os grafismos mais efetuados pelas pessoas, por demonstrar conhecimento e concordância a documentos diversos. O exame grafoscópico de assinaturas disfarçadas é uma das determinações mais difíceis de proceder na Documentoscopia. Os disfarces podem confundir os peritos e conduzir a erros quanto à autoria de assinaturas. O objetivo deste trabalho foi identificar as características mais frequentes encontradas em análises grafoscópicas de assinaturas disfarçadas. Foi solicitado a 102 voluntários que assinassem sua assinatura habitual por cinco vezes e, então, que tentassem disfarçar sua assinatura. Posteriormente, realizou-se o confronto gráfico entre as assinaturas padrão e as disfarçadas, e as alterações encontradas foram anotadas, sendo que as mais frequentes foram: modificações da forma de letras maiúsculas e minúsculas, de dimensão e calibre, na forma e na posição de ataques e remates, na quantidade de levantamentos da caneta durante a escrita (andamento gráfico) e a alteração ou supressão de símbolos ou caracteres especiais. Esses dados podem ajudar os peritos a identificar características gráficas indicativas de disfarces, quando da verificação de autenticidade. Por outro lado, observou-se que características alteradas com menor frequência surgem em assinaturas disfarçadas e podem levar a uma conclusão errônea no sentido da falsificação do lançamento gráfico.Palavras-Chave: Grafoscopia; Perícia Grafoscópica; Disfarce de Assinaturas. AbstractSignatures are the most common graphisms produced by people, which demonstrate acknowledgement and agreement to several documents. Signature disguise exam is among the most complicated kind of forged documents analysis. Disguises can confound the experts and lead to errors as to the authorship of a signature. This study aimed to identify the most frequent features found in the analysis of signature disguise. 102 volunteers were asked to write their signatures 5 times and then try to disguise it. Then, a confrontation between their original signatures and the disguised ones was carried out, in which all the observed characteristics were recorded. The most frequent ones were: alteration in the format of upper and lowercase letters, general size, change in initial and terminal strokes, variations in the quantity of pen lifts during the writing and alteration or suppression of a symbol. This body of data might help experts to suspect of disguises, but even others unusual characteristics can also appear in disguises and may lead to misinterpret them as forgery.

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The probative character of Forensic Handwriting Examiners’ identification and elimination opinions on questioned signatures

Cited by 25 publications

References 4 publications

The Dynamic Character of Disguise Behavior for Text‐based, Mixed, and Stylized Signatures

The Dynamic Character of Disguise Behavior for Text‐based, Mixed, and Stylized Signatures

Forensic handwriting examiners’ opinions on the process of production of disguised and simulated signatures

Estudo das características gráficas mais frequentemente alteradas em disfarces de assinaturas

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