Bruno L. Giordano, researcher from MGill University, will give a seminar on "Perception of the sound source in purely auditory and
multisensory contexts" on Monday July 14th at 12:30 in room 301 of Ocata.
Abstract: Perceptual systems provide the organism with a knowledge of
the objects and events that structure the available sensory information.
Classical research on audition provides a partial account of the
integration of sensory information in everyday perceptual judgments,
leaving an empty space between the laboratory and the everyday world.
The study of the perception of the sound source aims at filling such a
gap. In this talk, I will outline four studies on the perception of the
sound source, in purely auditory and multisensory contexts. A first
study investigated the identification of the material of struck objects.
Biases in identification responses were interpreted as a result of the
internalization of statistical regularities in the acoustical
environment. A second study assessed the estimation of the similarity of
living and nonliving sound sources. Results pointed toward a symbolic
listening mode for living sound events, focused on abstract information,
and toward a sensory listening mode for nonliving sound events, based on
acoustical information. A third study investigated non-visual
identification of real walking grounds, focusing on auditory, haptic and
proprioceptive information. Multisensory integration yielded different
results depending on the classes of investigated materials. For solid
materials (e.g., marble), discrimination abilities slightly improved in
a multisensory context. For aggregate materials (e.g., gravels),
multisensory discrimination was significantly impaired. A final study
assessed the integration of auditory and haptic information in
action-based perception of striking events. For each single participant,
the modality that dominated in a multisensory context was that
associated with the largest effects in a unimodal context, and not the
most reliable modality which allowed the most precise control of action.
However, unimodal reliability appeared to predict modality dominance at
the population level.