Witnesses were asked to identify a young adult female target to whom t
hey had spoken for 15 seconds five minutes earlier in a naturalistic f
ield setting. Subjects were given a single facial photograph or a sing
le tape-recorded voice of either the target or a highly similar foil,
or a target-present or target-absent six-person photo lineup or six-pe
rson voice lineup. Identification of the target was superior in the si
x-person photo lineup than in the one-person photo lineup when choices
were corrected for guessing. False identifications of the 'innocent'
suspect did not differ in one-person and six-person photo lineups. How
ever, the diagnosticity index indicated that witnesses were twice as l
ikely to be more accurate than inaccurate in making a selection with t
he six-person photo lineup than in the one-person lineup. Performance
was poor in both one-person and six-person voice lineups. With the exc
eption of the target-absent one-person photo lineup, no significant co
rrelations were found between confidence and performance.