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Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

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The mid-difference hump in forward-masked intensity discrimination.

Daniel Oberfeld¹

¹Department of Psychology, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany. oberfeld@uni-mainz.de

The Journal of the Acoustical Society of America

|March 19, 2008

Summary

This summary is machine-generated.

Forward maskers significantly impact intensity resolution, showing a "mid-difference hump" where effects are strongest at intermediate masker-standard differences. This suggests masker-standard similarity modulates intensity discrimination.

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Area of Science:

Auditory perception
Psychoacoustics
Signal processing in hearing

Background:

Intensity discrimination is crucial for understanding speech and music.
Forward masking, where a masker precedes a target sound, can impair intensity resolution.
The relationship between masking effects and loudness perception requires further investigation.

Purpose of the Study:

To investigate the effect of forward-masked pure-tone intensity-difference limens (DLs) across various masker-standard level differences.
To explore the influence of masker-standard similarity on intensity resolution.
To examine the relationship between masker-induced changes in DLs and loudness perception.

Main Methods:

Measured intensity-difference limens (DLs) for pure-tone standards at low, medium, and high levels.
Varied masker-standard level differences to assess their impact on DLs.
Measured target loudness changes induced by the masker for the same listeners.

Main Results:

A "mid-difference hump" was observed at a 25 dB SPL standard level, with greater DL elevation at intermediate masker-standard differences.
The masker's effect on DLs was larger for a 55 dB SPL standard than a 25 dB SPL standard, supporting a midlevel hump.
Loudness enhancement also showed a mid-difference hump pattern, and a significant correlation was found between loudness changes and DL elevations, though not a one-to-one relationship.

Conclusions:

Forward masker effects on intensity resolution are modulated by masker-standard similarity.
Evidence supports a midlevel hump in auditory processing, affecting both intensity discrimination and loudness perception.
While loudness changes correlate with masking-induced DL elevations, the relationship is complex and not strictly linear.