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Auditory attentional bandwidth: effect of level and frequency range
1Laboratoire de Psychologie Expérimentale, Université René Descartes, CNRS, EPHE, Paris, France.
The Journal of the Acoustical Society of America
|November 1, 1995
Summary
This study reveals that auditory attention is more complex than simple auditory filtering. Attentional focusing adapts dynamically, suggesting a central process influences sound detection beyond basic auditory processing.
Area of Science:
- Auditory perception
- Psychoacoustics
- Cognitive neuroscience
Background:
- Auditory filters shape sound perception.
- Attentional filters influence signal detection in noise.
- The relationship between auditory and attentional filtering remains unclear.
Purpose of the Study:
- To investigate the relationship between theoretical auditory filters and observed "attentional filters".
- To assess how noise level and probe frequency range affect auditory signal detectability.
- To determine if attentional focusing is solely based on auditory filtering.
Main Methods:
- Used a two-interval, forced-choice (2IFC) paradigm.
- Presented expected target tones as cues before observation intervals.
- Varied masker levels and probe frequency ranges (narrow vs. wide).
Main Results:
- In narrow frequency ranges, increased masker levels broadened probe-signal contours but improved detection only at distant frequencies.
- In wide frequency ranges, detection was less dependent on masker level, with better detection and wider attentional bands.
- Probe-signal detection improved with wider probe frequency ranges.
Conclusions:
- Attentional focusing does not directly mirror auditory filtering.
- A more central, adaptive cognitive process likely modulates auditory filter outputs.
- Auditory attention dynamically adjusts beyond passive filtering mechanisms.