![]() ![]() For the latter the process is called auditory scene analysis (ASA). ![]() Similarly, there are rules that govern the arrangement of low-level stimuli into haptic and auditory objects. Visual input is grouped into distinct objects based on Gestalt grouping rules such as feature proximity, similarity, continuity, closure, figure ground, and common fate ( Driver and Baylis, 1989 Ben-Av et al., 1992). In visual perception this is through scene analysis. To accomplish this, feature-based sensory representations must be recombined into object-based representations in a rule based manner. For example to attend to a speaker at a cocktail party we must select the low-level acoustic features that are relevant to the target, that is the person you are speaking with, from the environmental noise ( Cherry, 1953). These low-level processes are modulated by high-order processing to selectively attend to task relevant stimuli. Our sensory systems provide a rich coherent representation of the world through the integration and discrimination of input from multiple sensory modalities ( Spence, 2011). The findings suggest that early auditory processes of harmonic grouping dominate the object formation process and that the complexity of the signal, and additional sensory information have limited effect on this. We also found that this conflict was not negated with the provision of congruent audio–visual information. We found that listeners ( N = 36) performed worse in an object recognition task when the auditory feature-based representation was harmonically consonant. Here we used coarse sonified images in a two-tone discrimination task to test whether auditory feature-based representations of visual objects would be confounded when their features conflicted with the principles of auditory consonance. However, we don’t yet know what role the auditory system plays in the object integration stage and whether the principles of auditory scene analysis apply. Visual-to-auditory sonifications provide a complex, feature-based auditory representation that must be decoded and integrated into an object-based representation by the listener. When the visual sense is impaired, hearing and touch must take primary roles and in recent times compensatory techniques have been developed that employ the tactile or auditory system as a substitute for the visual system. A critical task for the brain is the sensory representation and identification of perceptual objects in the world. ![]()
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