Spots: breathing, drifting and scattering in a neural field model
Two dimensional neural field models with short range excitation and long range inhibition can exhibit localised solutions in the form of spots. Moreover, with the inclusion of a spike frequency adaptation current, these models can also support breathers and travelling spots. In this chapter we show...
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| Format: | Book Section |
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Springer
2014
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| Online Access: | https://eprints.nottingham.ac.uk/35213/ |
| _version_ | 1848795029623013376 |
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| author | Coombes, Stephen Schmidt, Helmut Avitabile, Daniele |
| author2 | Coombs, Stephen |
| author_facet | Coombs, Stephen Coombes, Stephen Schmidt, Helmut Avitabile, Daniele |
| author_sort | Coombes, Stephen |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Two dimensional neural field models with short range excitation and long range inhibition can exhibit localised solutions in the form of spots. Moreover, with the inclusion of a spike frequency adaptation current, these models can also support breathers and travelling spots. In this chapter we show how to analyse the proper- ties of spots in a neural field model with linear spike frequency adaptation. For a Heaviside firing rate function we use an interface description to derive a set of four nonlinear ordinary differential equations to describe the width of a spot, and show how a stationary solution can undergo a Hopf instability leading to a branch of pe- riodic solutions (breathers). For smooth firing rate functions we develop numerical codes for the evolution of the full space-time model and perform a numerical bifur- cation analysis of radially symmetric solutions. An amplitude equation for analysing breathing behaviour in the vicinity of the bifurcation point is determined. The con- dition for a drift instability is also derived and a center manifold reduction is used to describe a slowly moving spot in the vicinity of this bifurcation. This analysis is extended to cover the case of two slowly moving spots, and establishes that these will reflect from each other in a head-on collision. |
| first_indexed | 2025-11-14T19:25:35Z |
| format | Book Section |
| id | nottingham-35213 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:25:35Z |
| publishDate | 2014 |
| publisher | Springer |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-352132020-05-04T16:49:21Z https://eprints.nottingham.ac.uk/35213/ Spots: breathing, drifting and scattering in a neural field model Coombes, Stephen Schmidt, Helmut Avitabile, Daniele Two dimensional neural field models with short range excitation and long range inhibition can exhibit localised solutions in the form of spots. Moreover, with the inclusion of a spike frequency adaptation current, these models can also support breathers and travelling spots. In this chapter we show how to analyse the proper- ties of spots in a neural field model with linear spike frequency adaptation. For a Heaviside firing rate function we use an interface description to derive a set of four nonlinear ordinary differential equations to describe the width of a spot, and show how a stationary solution can undergo a Hopf instability leading to a branch of pe- riodic solutions (breathers). For smooth firing rate functions we develop numerical codes for the evolution of the full space-time model and perform a numerical bifur- cation analysis of radially symmetric solutions. An amplitude equation for analysing breathing behaviour in the vicinity of the bifurcation point is determined. The con- dition for a drift instability is also derived and a center manifold reduction is used to describe a slowly moving spot in the vicinity of this bifurcation. This analysis is extended to cover the case of two slowly moving spots, and establishes that these will reflect from each other in a head-on collision. Springer Coombs, Stephen Beim Graben, Peter Potthast, Roland Wright, James 2014-06-17 Book Section PeerReviewed Coombes, Stephen, Schmidt, Helmut and Avitabile, Daniele (2014) Spots: breathing, drifting and scattering in a neural field model. In: Neural fields: theory and applications. Springer, Berlin, pp. 187-211. ISBN 9783642545931 http://www.springer.com/us/book/9783642545924 |
| spellingShingle | Coombes, Stephen Schmidt, Helmut Avitabile, Daniele Spots: breathing, drifting and scattering in a neural field model |
| title | Spots: breathing, drifting and scattering in a neural field model |
| title_full | Spots: breathing, drifting and scattering in a neural field model |
| title_fullStr | Spots: breathing, drifting and scattering in a neural field model |
| title_full_unstemmed | Spots: breathing, drifting and scattering in a neural field model |
| title_short | Spots: breathing, drifting and scattering in a neural field model |
| title_sort | spots: breathing, drifting and scattering in a neural field model |
| url | https://eprints.nottingham.ac.uk/35213/ https://eprints.nottingham.ac.uk/35213/ |