A method for calculating the strength of evidence associated with an earwitness’s claimed recognition of a familiar speaker

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.

Publication DOI: https://doi.org/10.1016/j.scijus.2019.07.001
Divisions: Engineering & Applied Sciences > Computer Science
Engineering & Applied Sciences
Languages & Social Sciences > Aston Institute for Forensic Linguistics
Languages & Social Sciences > English
Languages & Social Sciences
Additional Information: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Uncontrolled Keywords: Bayes factor,Earwitness,Familiar speaker recognition,Likelihood ratio,Strength of evidence,Pathology and Forensic Medicine
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2019-11-01
Published Online Date: 2019-07-09
Accepted Date: 2019-07-02
Authors: Rosas, Claudia
Sommerhoff, Jorge
Morrison, Geoffrey Stewart ( 0000-0001-8608-8207)

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