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Unmasking the magnitude estimation response.

S Mori¹, L M Ward

¹Department of Psychology, University of British Columbia, Vancouver, Canada.

Canadian Journal of Psychology

|March 1, 1990

Summary

This study investigates sequential dependencies in psychophysical scaling. Results show that sequential dependencies on previous stimuli do not inversely relate to stimulus information, contradicting some prior findings.

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Area of Science:

Psychology
Psychophysics
Cognitive Science

Background:

The fuzzy judgment model predicts an inverse relationship between stimulus information and sequential dependencies.
Previous research shows mixed results regarding this inverse relationship in psychophysical tasks.
Contradictions exist between findings for magnitude estimation and absolute identification tasks.

Purpose of the Study:

To explore the contradiction in findings regarding sequential dependencies and stimulus information.
To investigate the fuzzy judgment model's predictions in psychophysical scaling.
To determine if judgment strategies change under low-information conditions.

Main Methods:

Conducted a magnitude estimation of loudness experiment.
Manipulated stimulus information using informational masking.
Used an absolute identification with feedback experiment to validate informational masking effectiveness.

Main Results:

Magnitude estimation results mirrored Ward's (1979) findings, showing no inverse relation for previous stimuli.
Sequential dependencies on previous stimuli failed to vary inversely with stimulus information.
Informational masking effectively reduced stimulus information in the absolute identification task.

Conclusions:

The failure of sequential dependencies on previous stimuli to vary inversely with stimulus information is generalized.
Altered judgment strategies under low-information conditions are necessary to explain the observed results.
Findings suggest a more complex interaction between stimulus information and sequential dependencies than previously modeled.

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