Dissociation in cross-feature integration between behavioral and pupil dilation responses in auditory deviant...

Area of Science:

• Auditory Neuroscience
• Cognitive Psychology
• Acoustic Signal Processing

Background:

• Detecting unusual sounds in complex environments relies on monitoring acoustic features like pitch, timbre, and loudness.
• Both behavioral responses and pupil dilation responses (PDR) can signal changes in acoustic features, but their integration in complex soundscapes is not well understood.

Purpose of the Study:

• To investigate how cross-feature interactions contribute to the detection of auditory deviance.
• To compare the integration of acoustic cues in behavioral responses versus pupil dilation responses (PDR).

Main Methods:

• Participants performed a deviant-detection task while listening to dynamic soundscapes with deviant events.
• Pupil dilation responses (PDR) were recorded.
• The Dynamic Regularity Extraction (D-REX) model was used to quantify feature-specific and integrated surprisal in the stimuli.

Main Results:

• Behavioral responses demonstrated clear integration of information across multiple acoustic features.
• Pupil dilation responses (PDR) were better explained by individual acoustic feature surprisal, with limited evidence of cross-feature integration.
• A dissociation was observed between the physiological (PDR) and behavioral measures of auditory deviance detection.

Conclusions:

• Auditory deviance detection involves different integration mechanisms for behavioral and physiological responses.
• Findings provide a framework for understanding how acoustic scene structure relates to different response modalities in auditory perception.