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Related Concept Videos

Masking and Demasking Agents01:19

Masking and Demasking Agents

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Related Experiment Video

Updated: Apr 10, 2026

A Method for Tracking the Time Evolution of Steady-State Evoked Potentials
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Probing Spectral Masking With Auditory Steady-State Responses.

Anna Sergeeva1, Preben Kidmose

  • 1Department of Electrical and Computer Engineering, Aarhus University, Aarhus, Denmark.

Ear and Hearing
|April 9, 2026
PubMed
Summary
This summary is machine-generated.

Auditory steady-state responses (ASSRs) are affected by spectral masking, varying with masker intensity and probe frequency. This study suggests ASSRs can objectively probe individual auditory masking thresholds.

Keywords:
ASSRAuditory evoked potentialsElectrophysiological masking thresholdsSpectral masking

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Area of Science:

  • Auditory Neuroscience
  • Electrophysiology
  • Psychoacoustics

Background:

  • Behavioral auditory masking measurements are crucial for hearing models but limited in clinical use due to attention dependence and time consumption.
  • Auditory steady-state responses (ASSRs) offer an objective alternative for estimating auditory thresholds, especially for non-responsive individuals.
  • The relationship between ASSRs and behavioral masking remains unclear, necessitating investigation into spectral masking effects on ASSRs.

Purpose of the Study:

  • To investigate how spectral masking influences auditory steady-state responses (ASSRs).
  • To determine the relationship between ASSR masking effects and behavioral masking thresholds.
  • To test the hypothesis that ASSR masking effects are constant when probes are presented at equal levels above behavioral masking thresholds.

Main Methods:

  • 25 normal-hearing adults participated in the study.
  • Behavioral masking thresholds were measured using a low-pass noise masker.
  • ASSRs were recorded with and without maskers using scalp- and ear-EEG, with probe signals presented at varying levels above behavioral thresholds.

Main Results:

  • ASSR amplitudes were reduced in the presence of a masker, confirming its influence on electrophysiological responses.
  • The magnitude of the masking effect varied with masker intensity and probe frequency, contradicting the initial hypothesis.
  • Data suggest electrophysiological responses integrate across auditory filters, while behavioral detection relies on the highest signal-to-noise ratio filter.

Conclusions:

  • ASSRs are systematically influenced by spectral masking, with effects dependent on masker intensity, probe frequency, and presentation level.
  • ASSRs demonstrate potential as an objective tool for assessing individual auditory masking thresholds.
  • The findings highlight the utility of ASSRs in probing auditory masking beyond standard audiometry.