Dynamic plasticity in coupled avian midbrain maps

Atwal, G. S. (December 2004) Dynamic plasticity in coupled avian midbrain maps. Phys Rev E Stat Nonlin Soft Matter Phys, 70 (6 Pt 1). 061904. ISSN 1539-3755 (Print)1539-3755 (Linking)

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URL: http://www.ncbi.nlm.nih.gov/pubmed/15697399
DOI: 10.1103/PhysRevE.70.061904

Abstract

Internal mapping of the external environment is carried out using the receptive fields of topographic neurons in the brain, and in a normal barn owl the aural and visual subcortical maps are aligned from early experiences. However, instantaneous misalignment of the aural and visual stimuli has been observed to result in adaptive behavior, manifested by functional and anatomical changes of the auditory processing system. Using methods of information theory and statistical mechanics a model of the adaptive dynamics of the aural receptive field is presented and analyzed. The dynamics is determined by maximizing the mutual information between the neural output and the weighted sensory neural inputs, admixed with noise, subject to biophysical constraints. The reduced costs of neural rewiring, as in the case of young barn owls, reveal two qualitatively different types of receptive field adaptation depending on the magnitude of the audiovisual misalignment. By letting the misalignment increase with time, it is shown that the ability to adapt can be increased even when neural rewiring costs are high, in agreement with recent experimental reports of the increased plasticity of the auditory space map in adult barn owls due to incremental learning. Finally, a critical speed of misalignment is identified, demarcating the crossover from adaptive to nonadaptive behavior.

Item Type: Paper
Uncontrolled Keywords: Adaptation, Physiological/physiology Animals Auditory Cortex/physiology Auditory Pathways/ physiology Auditory Perception/ physiology Computer Simulation Feedback Mesencephalon/ physiology Models, Neurological Nerve Net/ physiology Neuronal Plasticity/ physiology Strigiformes/ physiology Visual Pathways/ physiology
Subjects: organism description > animal
organism description > animal > bird
organs, tissues, organelles, cell types and functions > organs types and functions > brain
organs, tissues, organelles, cell types and functions > cell types and functions > cell functions
organs, tissues, organelles, cell types and functions > cell types and functions
organs, tissues, organelles, cell types and functions > cell types and functions > cell functions > neural plasticity
organs, tissues, organelles, cell types and functions > organs types and functions
organs, tissues, organelles, cell types and functions
CSHL Authors:
Communities: CSHL labs > Atwal lab
Depositing User: Matt Covey
Date: December 2004
Date Deposited: 04 Mar 2013 20:20
Last Modified: 04 Mar 2013 20:20
Related URLs:
URI: http://repository.cshl.edu/id/eprint/27722

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