Research reported nearly 20 years ago concluded that the ability to make auditory pitch discriminations is impaired in some Ss by prolonged listening to sonar returns. As a special type of pitch discrimination, discrimination of doppler, is of importance in classifying sonar signals, an experiment was performed to determine whether or not listening to sonar returns for 90 minutes impairs the ability to discriminate doppler. No impairment was found. A second aim of this experiment was to evaluate the effectiveness of an alertness indicator when listening for sonar signals. With the indicator 16 per cent more signals were detected than without it.
BakerC. H.Maintaining the level of vigilance by means of artificial signals.J. appl. Psychol., 1960b,44, 336–338
3.
BakerC. H.Further toward a theory of vigilance. In BucknerD. N.McGrathJ. J. (Eds.), Vigilance: A Symposium.New York: McGraw-Hill, 1963
4.
BakerC. H.HarabedianA.A study of target detection by sonar operators.Human Factors Research, Inc. for the Psychol. Sciences Div., ONR, Contract Nonr 2649(00), Tech. Rep. 206-16, 1962
5.
BroadbentD. E.Some recent research from the Applied Psychology Research Unit, Cambridge. In BucknerD. N.McGrathJ. J. (Eds.), Vigilance: A Symposium.New York: McGraw-Hill, 1963
6.
DossettW. F.Extension of chi square as a nonparametric method in the analysis of experimental data.TEMPO, General Elec. Co., Santa Barbara, Report RM61TMP-40, 1961
7.
ElliottE.Perception and alertness.Ergonomics, 1960,3, 357–364
8.
GuilfordJ. P.Psychometric Methods. New York: McGraw-Hill, 2nd ed., 1954
9.
MackworthJane F.TaylorM. M.The d' measure of signal detectability in vigilance-like situations.Cdn. J. Psychol., 1963,17, 302–325
10.
SolandtD. Y.PartridgeRuthC.Research on auditory problems presented by naval operations.J. Cdn. Med. Services, 1946,3, 323–329
11.
WienerE. L.Knowledge of results and signal rate in monitoring.J. appl. Psychol., 1963,47, 214–222
