Abstract
Subjects listened to a sequence of Gaussian noise pulses of 0.5-sec duration, occurring at 2.5-sec intervals. Performance was compared under two conditions: One group detected the occurrence of a 1.8-dB increment in noise pulses; a second group detected the occurrence of increments of 1.3, 1.8, or 2.3 dB. All Ss performed for three 90-min sessions on different days The usual trends were noted for hits and false alarms. TSD indices, d’ and β were also derived. For both groups, it was found that d′ increased slightly over sessions and decreased almost negligibly during sessions, and criterion indices, β generally increased slightly both within and over sessions. Performance was generally comparable under the fixed- and mixed-signal conditions.
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The research reported was supported by the U.S. Army Medical Research and Development Command, Department of the Army, under Research Contract No. DA-49-193-MD-2197, and based in part on a paper presented to the Psychonomie Society, Chicago, Illinois, October 1967. The authors are indebted to Lois Hohmann, Ernest Weiier, Thomas Olkowski, and Kathleen McDaniel for technical assistance. When the experiment was planned and the Ss run, the third author was at the U.S. Army Medical Research Laboratory.
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Thurmond, J.B., Binford, J.R. & Loeb, M. Effects of signal to noise variability over repeated sessions in an auditory vigilance task. Perception & Psychophysics 7, 100–102 (1970). https://doi.org/10.3758/BF03210142
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DOI: https://doi.org/10.3758/BF03210142