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Four listeners rated their confidence of whether
an occluder had been present or absent in the
path of the sound stimulus that they heard in three
reverberant contexts: under anechoic conditions
(circles), with the addition of reverberation
simulating a large room (squares), and with
reverberation simulating a small room
(diamonds). The figure shows the relative
frequency of response in each of the five
categories, where the "5" response was used to
indicate maximum confidence that the occluder
had been present between microphone and
speaker when the recording was made.