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Description
Local-global temporal auditory processing reflects how complex auditory scenes are organized over time, with global processing typically dominating local processing. This study investigates how aided hearing impaired (aHI) listening shapes the local-global processing and its interaction with increased salience on local elements.In a psychophysical task, on each trial participants (young Normal Hearing NH) were asked to compare the local and global levels (divided attention task) of two melodies composed of three sweeps, each moving upward or downward in pitch (local level) with their relative pitches forming an upward or downward pattern (global level). Timbre was sometimes altered in one sweep to create local salience. Two listening conditions were tested (NH vs. aHI* using hearing loss and hearing aid simulators) to minimize high-level confounding factors associated with hearing loss.Data were analyzed using a two-dimensional signal detection theory framework to assess perceptual interferences between local and global dimensions. Results revealed no effect of listening condition, indicating robustness of temporal processing to acoustic variations. Salience impaired both local and global processing, with a stronger impact than previously reported. Finally, GRT uncovered marked inter-individual differences in perceptual maps, which will be discussed.