Identifying voices using confidence judgments under deadline pressure
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Voice identification from categorical lineups can be error-prone. Here we test whether Brewer et al. (2012)’s radical alternative to categorical face lineups also improves classification accuracy for earwitnesses. Brewer et al. (2012)’s procedure requires witnesses to rate, under deadline pressure, how confident they are that each lineup member matches their memory for the perpetrator. Participants (N=803) attempted to identify a ‘perpetrator’ from a categorical voice lineup, a confidence-based voice lineup with deadlines, or a confidence-based voice lineup without deadlines. Taking the results of the accuracy and signal detection analyses together, we do not conclude that confidence-based lineups optimise voice identification accuracy. Neither the deadline nor the no-deadline confidence-based procedures appear to be a promising alternative to categorical voice lineups. These results further highlight the need to test procedures for faces and voices separately, rather than assuming that patterns of performance observed for faces will also be observed for voices.
