Editing Absolute threshold of hearing (section)

=== Forced-choice methods ===
Two intervals are presented to a listener, one with a tone and one without a tone. The listener must decide which interval had the tone in it. The number of intervals can be increased, but this may cause problems for the listener who has to remember which interval contained the tone.<ref name="Gelfand, 1990"/><ref name="Miller et al., 2002">Miller et al., 2002. "Nonparametric relationships between single-interval and two-interval forced-choice tasks in the theory of signal detectability". Journal of Mathematical Psychology archive. 46:4;383–417. Available from: http://portal.acm.org/citation.cfm?id=634580. Accessed 1 March 2007.</ref>