A comparison of method-of-adjustment and forced-choice procedures in frequency discrimination

Craig C. Wier, Walt Jesteadt, David M. Green

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Reported estimates of the frequency difference limen (DL) for tones show considerable variability. To determine the extent that the differences are dependent on psychophysical method, three estimates of the DL at 1,000 Hz were obtained from the same subjects for each of three psychophysical procedures. The three estimates were: (1) the standard deviation of final settings in a methbd of adjustment, (2) the average of several reversals in an adaptive two-interval forced-choice procedure, and (3) the 76%-correct point in a two-interval forced-choice procedure using constant stimuli. The two forced-choice procedures yielded very similar DLs. The adjustment procedure yielded significantly smaller estimates. Possible reasons for the different values produced by adjustment procedures and the nature of the underlying decision process are discussed.

Original languageEnglish (US)
Pages (from-to)75-79
Number of pages5
JournalPerception & Psychophysics
Issue number1
StatePublished - Jan 1976
Externally publishedYes

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Sensory Systems
  • Psychology(all)


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