Electrophysiological Correlates of Intensity Resolution Under Forward Masking

Oberfeld, Daniel

doi:10.1007/978-1-4419-5686-6_10

Cited by 5 publications

(2 citation statements)

References 39 publications

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“…Second, a long-term loudness is calculated via temporal integration of the shortterm loudness with much longer time constants (attack: 99 ms, decay: 2000 ms). Glasberg and Moore (2002) assumed that the long-term loudness might correspond to a memory for the loudness of an event, which could last for several seconds (see also Oberfeld, 2010). A combination of the decay of specific loudness in Zwicker's approach and the long time constants proposed by Glasberg and Moore (2002) could be used to model the data of the present study.…”

Section: F Implications For Loudness Modelsmentioning

confidence: 96%

Spectral loudness summation of nonsimultaneous tone pulses

Heeren

Rennies

Verhey

2011

The Journal of the Acoustical Society of America

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The level of broadband signals is usually lower than that of equally loud narrow-band signals. This effect, referred to as spectral loudness summation, is commonly measured for broadband signals where all frequency components are presented simultaneously. The present study investigated to what extent spectral loudness summation also occurs for nonsimultaneously presented frequency components. Spectral loudness summation was measured in normal-hearing listeners with an adaptive forced-choice procedure for sequences of short tone pulses with varying frequencies, randomly chosen from a set of five frequencies. In addition, spectral loudness summation was measured for the simultaneous presentation of all five frequencies. The comparison stimulus consisted of tone pulses with the same frequency for all tone pulses of the sequence and the same repetition rate and overall duration as the test signal. The pulse duration was 10, 20, 50, or 100 ms and the inter-pulse interval ranged from 0 to 390 ms. In general, a considerable nonsimultaneous spectral loudness summation was found for short pulse durations and inter-pulse intervals, but a residual effect was also observed for the largest inter-pulse interval. The data are discussed in the light of repetition-rate dependent spectral loudness summation and effects of persistence of specific loudness after tone-pulse offset.

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Section: F Implications For Loudness Modelsmentioning

confidence: 96%

Spectral loudness summation of nonsimultaneous tone pulses

Heeren

Rennies

Verhey

2011

The Journal of the Acoustical Society of America

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“…It could be that response components other than P2 (e.g., N1) may reflect different aspects of loudness processing and therefore are less, or even oppositely, affected. One of the rare studies combining context effects of loudness and neural responses found that the amplitude of the N1 deflection represents an electrophysiological correlate of the effects of nonsimultaneous masking on intensity resolution (Oberfeld, 2010), which possibly also indicates a direct relation between the AEP deflection amplitudes and loudness enhancement at short ISIs (Oberfeld, 2008). However, the temporal properties of loudness enhancement and ILR are different, suggesting possibly different underlying mechanisms affecting the two processes.…”

Section: Introductionmentioning

confidence: 99%

Neural Representation of Loudness: Cortical Evoked Potentials in an Induced Loudness Reduction Experiment

2020

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Loudness context effects comprise differences in judgments of the loudness of a target stimulus depending on the presence of a preceding inducer tone. Interstimulus intervals (ISIs) between inducer tone and target tone of about 200 ms and above cause an induced loudness reduction (ILR) of the target tone. As the ILR increases, respectively, the perceived loudness of the target stimuli decreases with increasing ISI. This in turn means that identical stimuli in a different context have a differently perceived loudness. A correlation between specific characteristics in the electroencephalography responses and perceived loudness in an ILR experiment would therefore provide a neurophysiological indication of loudness processing beyond a neural representation of stimulus intensity only. To examine if such a correlation exists, we investigated cortical electroencephalography responses in a latency range from 75 to 510 ms during a psychoacoustical ILR experiment with different ISIs. With increasing ISI, the strength of the N1-P2 deflection of the respective electroencephalography response decreases similarly to the loudness perception of the target tone pulse. This indicates a representation based on loudness rather than on intensity at the corresponding processing stage.

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Sequential Grouping Modulates the Effect of Non-Simultaneous Masking on Auditory Intensity Resolution

Oberfeld

Stahn

2012

PLoS ONE

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The presence of non-simultaneous maskers can result in strong impairment in auditory intensity resolution relative to a condition without maskers, and causes a complex pattern of effects that is difficult to explain on the basis of peripheral processing. We suggest that the failure of selective attention to the target tones is a useful framework for understanding these effects. Two experiments tested the hypothesis that the sequential grouping of the targets and the maskers into separate auditory objects facilitates selective attention and therefore reduces the masker-induced impairment in intensity resolution. In Experiment 1, a condition favoring the processing of the maskers and the targets as two separate auditory objects due to grouping by temporal proximity was contrasted with the usual forward masking setting where the masker and the target presented within each observation interval of the two-interval task can be expected to be grouped together. As expected, the former condition resulted in a significantly smaller masker-induced elevation of the intensity difference limens (DLs). In Experiment 2, embedding the targets in an isochronous sequence of maskers led to a significantly smaller DL-elevation than control conditions not favoring the perception of the maskers as a separate auditory stream. The observed effects of grouping are compatible with the assumption that a precise representation of target intensity is available at the decision stage, but that this information is used only in a suboptimal fashion due to limitations of selective attention. The data can be explained within a framework of object-based attention. The results impose constraints on physiological models of intensity discrimination. We discuss candidate structures for physiological correlates of the psychophysical data.

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Electrophysiological Correlates of Intensity Resolution Under Forward Masking

Cited by 5 publications

References 39 publications

Spectral loudness summation of nonsimultaneous tone pulses

Spectral loudness summation of nonsimultaneous tone pulses

Neural Representation of Loudness: Cortical Evoked Potentials in an Induced Loudness Reduction Experiment

Sequential Grouping Modulates the Effect of Non-Simultaneous Masking on Auditory Intensity Resolution

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