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A method for calculating the strength of evidence associated with an earwitness's claimed recognition of a familiar speaker |
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| Authors: | Claudia Rosas Jorge Sommerhoff Geoffrey Stewart Morrison |
| Affiliation: | 1. Instituto de Lingüística y Literatura, Universidad Austral de Chile, Valdivia, Región de los Ríos, Chile;2. Instituto de Acústica, Universidad Austral de Chile, Valdivia, Región de los Ríos, Chile;3. Forensic Speech Science Laboratory, Aston Institute for Forensic Linguistics, and Centre for Forensic Data Science, Department of Computer Science, Aston University, Birmingham, England, United Kingdom;4. Forensic Evaluation Ltd, Birmingham, England, United Kingdom |
| Abstract: | The present paper proposes and demonstrates a method for assessing strength of evidence when an earwitness claims to recognize the voice of a speaker who is familiar to them. The method calculates a Bayes factor that answers the question: What is the probability that the earwitness would claim to recognize the offender as the suspect if the offender was the suspect versus what is the probability that the earwitness would claim to recognize the offender as the suspect if the offender was not the suspect but some other speaker from the relevant population? By “claim” we mean a claim made by a cooperative earwitness not a claim made by an earwitness who is intentionally deceptive. Relevant data are derived from naïve listeners' responses to recordings of familiar speakers presented in a speaker lineup. The method is demonstrated under recording conditions that broadly reflect those of a real case. |
| Keywords: | Corresponding author. Earwitness Familiar speaker recognition Strength of evidence Likelihood ratio Bayes factor |
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