Adaptation of the Top-Down Hierarchical model of pitch for explaining tempo perception.

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Contents

Adaptation of hierarchical model of pitch for explaining tempo perception changes

by Emili Balaguer-Ballester , Leigth Smith, Matin Coath, Sue Denham.

University of Plymouth, University of Amsterdam

emili.balaguer@uv.es

emili.balaguer-ballester@plymouth.ac.uk

10-sept-2008

The software is currently unavailable for public download.

What is the Module?

Modelling the neural processing of pitch is essential for understanding the perceptual phenomenology of music and speech. Work package 6 report describes a neurocomputational model for explaining the perception of pitch in its temporal context. This study had suggested that a top-down modulation within a hierarchical processing structure is critical for understanding the stimulus- and task-dependency of the effective integration time for pitch information. The model provided a successful explaining for the dichotomy between temporal integration and resolution in pitch perception; which appears to be a more general paradox in auditory temporal processing.

This raises the question of whether the ability of the model to adjust the multiple time scales involved in auditory processing could also account for higher cognitive task involved in the perception of rhythm. This module contains an adaptation of the pitch perception model which advances in that direction. It illustrates how exactly the same model, using different inputs, also explains some interesting aspects of tempo change perception.


What are the inputs, outputs and parameters?

Parameters may be sustained to continuous improvements. Please see 'How to use' section for a comprehensive description of current version.

System requirements

Matlab, any recent version, no toolboxes.


How to Cite

NO CITATION BECAUSE THE MANUSCRIPT WHICH DESCRIBED THE ORIGINAL MODEL IS NOT ACCEPTED YET

Balaguer-Ballester E., Clark, N., Coath, M., Krumholz, K. and Denham, S. L., 2008. Understanding Pitch Perception as a Hierarchical Process with Top-Down Modulation.

Information about the application of this model in tempo perception can be found in the corresponding report, only accessible to reviewers at this moment.

How to use it

Emili Balaguer Sep 10 2008.

IMPORTANT: THIS SOFTWARE IS CONFIDENTIAL BECAUSE THE MANUSCRIPT IN WHICH IS BASED IS STILL UNDER REVIEW. PLEASE DO NOT CIRCULATE IT. IT IS ALSO SUBJECT TO CONTINUOUS IMPROVEMENTS. UPDATES WILL BE GIVEN INMEDIATELY IF THE MANUSCRIPT IS ACCEPTED.


Work funded by EMCAP project (Emergence Cognition Through Active Perception, 2005-2008) http://emcap.iua.upf.es

Model described in the manuscrit 'Understanding Pitch Perception as a Hierarchical Procces with Top-Down Modulation'

Adaptation of such a model for tempo change perception.

See http://www.pion.ac.uk/emili/index.htm for updates in the m-scripts and other software.

simply type

tempo('input_object')

where input_object.mat is any example file stored in the same directory, with the fields

input_object.sample_rate = sampling rate in Hz, typically 500 Hz (do not change this in the current implementation)

input_object.file_name = File name, a string

input_object.input_series = time series row vector, containing the analog output of the 'saliency model' (Coath et al., 2005). It has been obtained using the corresponding Auditory Saliency Model

There are lots of examples in this folder produced by Leigth Smith, http://www.leighsmith.com who also worked in the elaboration of the model, and also Martin Coath and Sue Denham.

Thanks very much

Emili Balaguer-Ballester