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Related Experiment Video

Updated: Oct 15, 2025

Simultaneous Evaluation of Cerebral Hemodynamics and Light Scattering Properties of the In Vivo Rat Brain Using Multispectral Diffuse Reflectance Imaging
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Effects of multiple early diffuse reflections on spatial percepts.

Chiara Visentin1, Matteo Pellegatti1, Nicola Prodi1

  • 1Department of Engineering, University of Ferrara, Ferrara, Italy.

The Journal of the Acoustical Society of America
|October 31, 2021
PubMed
Summary

This study investigates how diffuse surfaces in room acoustics affect auditory perception. Diffuse reflections significantly alter spatial sound attributes, offering new design criteria for performance venues.

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Area of Science:

  • Acoustics
  • Psychoacoustics
  • Architectural Acoustics

Background:

  • Diffuse surfaces are increasingly used in architectural acoustics, but their perceptual effects compared to specular surfaces are not well understood.
  • Previous research explored the simplest case of one lateral reflection; this study extends the analysis to pairs of reflections.

Purpose of the Study:

  • To systematically analyze the auditory perceptual effects of diffuse reflections in enclosed spaces.
  • To investigate how pairs of lateral reflections, with or without a ceiling reflection, influence spatial sound perception.

Main Methods:

  • Conducting detailed listening tests to evaluate auditory impressions.
  • Comparing perceptual effects of diffuse versus specular reflections in controlled acoustic environments.

Main Results:

  • Diffuse reflections were shown to modulate the perception of spatial attributes in sound.
  • The presence and characteristics of ceiling reflections alongside lateral ones were found to influence these modulations.

Conclusions:

  • Diffuse reflections play a crucial role in shaping the perceived spatial qualities of a room.
  • Findings provide essential data for acoustical designers incorporating diffusing surfaces into the first reflection design of rooms.