Archives of Acoustics, 37, 1, pp. 63–72, 2012

Objectivization of Audio-Visual Correlation Analysis

Bartosz KUNKA
Multimedia Systems Department, Gdańsk University of Technology

Multimedia Systems Department, Gdańsk University of Technology

Simultaneous perception of audio and visual stimuli often causes concealment or misrepresentation of
information actually contained in these stimuli. Such effects are called the “image proximity effect” or
the “ventriloquism effect” in the literature. Until recently, most research carried out to understand their
nature was based on subjective assessments. The authors of this paper propose a methodology based
on both subjective and objectively retrieved data. In this methodology, objective data reflect the screen
areas that attract most attention. The data were collected and processed by an eye-gaze tracking system.
To support the proposed methodology, two series of experiments were conducted – one with a commercial
eye-gaze tracking system Tobii T60, and another with the Cyber-Eye system developed at the Multimedia
Systems Department of the Gdańsk University of Technology. In most cases, the visual-auditory stimuli
were presented using a 3D video. It was found that the eye-gaze tracking system did objectivize the results
of experiments. Moreover, the tests revealed a strong correlation between the localization of a visual
stimulus on which a participant’s gaze focused and the value of the “image proximity effect”. It was also
proved that gaze tracking may be useful in experiments which aim at evaluation of the proximity effect
when presented visual stimuli are stereoscopic.
Keywords: sound perception; sound source localization; virtual sound source shifting; bi-modal percep- tion; cross-modal perception; image proximity effect; ventriloquism effect; visual attention; perceptual illusion; eye-gaze tracking
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