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Contextual effects on loudness judgments for sounds with continuous changes of intensity are reflected in nonauditory areas.
Behler, Oliver; Uppenkamp, Stefan.
Affiliation
  • Behler O; Medical Physics and Cluster of Excellence "Hearing4all", Department of Medical Physics and Acoustics, Faculty VI Medicine and Health Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany.
  • Uppenkamp S; Medical Physics and Cluster of Excellence "Hearing4all", Department of Medical Physics and Acoustics, Faculty VI Medicine and Health Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany.
Hum Brain Mapp ; 42(6): 1742-1757, 2021 04 15.
Article in En | MEDLINE | ID: mdl-33544429
Psychoacoustic research suggests that judgments of perceived loudness change differ significantly between sounds with continuous increases and decreases of acoustic intensity, often referred to as "up-ramps" and "down-ramps." The magnitude and direction of this difference, in turn, appears to depend on focused attention and the specific task performed by the listeners. This has led to the suspicion that cognitive processes play an important role in the development of the observed context effects. The present study addressed this issue by exploring neural correlates of context-dependent loudness judgments. Normal hearing listeners continuously judged the loudness of complex-tone sequences which slowly changed in level over time while auditory fMRI was performed. Regression models that included information either about presented sound levels or about individual loudness judgments were used to predict activation throughout the brain. Our psychoacoustical data confirmed robust effects of the direction of intensity change on loudness judgments. Specifically, stimuli were judged softer when following a down-ramp, and louder in the context of an up-ramp. Levels and loudness estimates significantly predicted activation in several brain areas, including auditory cortex. However, only activation in nonauditory regions was more accurately predicted by context-dependent loudness estimates as compared with sound levels, particularly in the orbitofrontal cortex and medial temporal areas. These findings support the idea that cognitive aspects contribute to the generation of context effects with respect to continuous loudness judgments.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Psychoacoustics / Temporal Lobe / Prefrontal Cortex / Loudness Perception Type of study: Prognostic_studies Limits: Adolescent / Adult / Female / Humans / Male Language: En Journal: Hum Brain Mapp Journal subject: CEREBRO Year: 2021 Document type: Article Affiliation country: Germany Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Psychoacoustics / Temporal Lobe / Prefrontal Cortex / Loudness Perception Type of study: Prognostic_studies Limits: Adolescent / Adult / Female / Humans / Male Language: En Journal: Hum Brain Mapp Journal subject: CEREBRO Year: 2021 Document type: Article Affiliation country: Germany Country of publication: United States