Understanding Pitch Perception as a Hierarchical Process with Top-Down Modulation
Previous studies suggest that the auditory system uses a wide range of time scales to integrate pitch-related information, and that the effective integration time is both task- and stimulus-dependent. None of the existing models of pitch processing can account for such task- and stimulus-dependent variations in processing time scales. This study presents an idealized neurocomputational model, which provides a unified account of the multiple time scales observed in pitch perception. The model is evaluated using a range of perceptual studies and a neurophysiological experiment. In contrast to other approaches, the current model contains a hierarchy of integration stages and uses feedback to adapt the effective time scales of processing at each stage in response to changes in the input stimulus. The model suggests a key role for efferent connections from central to sub-cortical areas in controlling the temporal dynamics of pitch processing.
KeywordsPitch perception processing Top-down modulation Temporal dynamics of pitch
This work was supported by EmCAP (Emergent Cognition through Active Perception, 2005-2008); a research project in the field of Music Cognition funded by the European Commission (FP6-IST, contract 013123) and by the EPSRC grant EP/C010841/1 (COLAMN). EBB wants to thank Ray Meddis for his very generous support, which was critical to the completion of this study.