Feature-dependent perception of auditory apparent motion in normally sighted and visually impaired people
Mon—Casino_1.811—Poster1—2303
Presented by: Meike Kriegeskorte
We can perceive objects as moving by connecting them across space and time. This is possible even when the objects are not present continuously, as in the case of apparent motion displays like the Ternus Display. In this display, two stimuli are presented, one at the centre and one shifted to the left, followed by a short break (ISI), after which two more stimuli are presented, one at the centre and one shifted to the right. This display is ambiguous, as depending on which stimuli are connected, two different types of motion can be perceived. Which percept is seen can be influenced by the ISI and the stimulus features, as stimuli that are closer together in time or more similar in features are more likely to be connected. The Ternus effect exists not only in the visual, but also in the auditory domain. The auditory percept is also dependent on the ISI and on the feature information, but the feature effect is much smaller. To investigate, whether the size of the feature effect might be due to the visual modality being more important to us, we compared the feature bias in normally sighted with visually impaired people. We expected that for visually impaired people the feature effect might be larger as the auditory modality is more important to them and more trained. Our results showed descriptive differences between both groups, suggesting that the visual ability might influence feature-dependent perception in auditory apparent motion.
Keywords: Apparent motion, auditory perception, visual ability