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Intensity discrimination in forward masking.

F G Zeng¹, C W Turner

¹House Ear Institute, Los Angeles, California 90057.

The Journal of the Acoustical Society of America

|August 1, 1992

Summary

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A midlevel hump in intensity discrimination, observed with forward masking, persists even with longer signal delays. This effect, linked to low-spontaneous rate neurons, diminishes with reduced masker levels and specific frequencies.

Area of Science:

Auditory Neuroscience
Psychoacoustics
Sensory Perception

Background:

A nonmonotonic intensity discrimination function with a midlevel hump was previously reported for forward-masked tones.
This hump occurred for specific signal levels and delays after an intense masker.

Purpose of the Study:

To investigate the influence of signal delay, masker level, and frequency on the midlevel hump in forward masking.
To further test the hypothesis that low-spontaneous rate (SR) neurons contribute to this phenomenon.

Main Methods:

Intensity discrimination was measured using just-noticeable differences (jnd's).
Experiments varied signal delays (50, 200, 400 ms), masker levels, and masker-signal frequency separation.

Main Results:

Related Experiment Videos

Forward-masked intensity jnd's at midlevels did not fully recover to unmasked values, even at a 400 ms delay.
The midlevel hump decreased in size with longer signal delays.
The effect diminished significantly with reduced masker levels (below 40 dB SPL) and was frequency-specific.

Conclusions:

Slow recovery of midlevel jnd's suggests involvement of low-SR neurons with slow recovery from forward masking.
Data support the hypothesis that low-SR neurons play a role in the midlevel hump of intensity discrimination during forward masking.