The effects of delay on voice recognition accuracy

Two experiments were conducted in which 176 listeners heard male and female objectively defined high- and low-recognition voices and then attempted to identify these voices from a voice parade containing 20 distractors after either 10, 40, 100, or 130 minutes (experiment 1), or 10 minutes, one day, seven days, or 14 days (experiment 2). In experiment 1 delay had no overall effect, although further analysis revealed that the shortest delay did produce better performance than all other delay conditions. Further, high-recognition voices were better identified than low-recognition voices. In experiment 2 delay had an overall effect, with the shortest delay interval again being significantly better than all other conditions, which did not differ among themselves. High- and low-recognition voices, however, did not exhibit a statistically significant difference, although these two factors entered into a marginally significant interaction. Theoretical speculation and forensic implications were drawn.This research was funded by the British Home Office, research grant no. RES 741/1/1, although the views expressed are not necessarily those of the funding body.