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Spatiotemporal pattern discrimination using predictive dynamic neural fields
BMC Neuroscience volume 13, Article number: O16 (2012)
Prediction and competition mechanisms are here combined into a neuro-inspired computational model in order to enhance robustness for spatiotemporal tracking and pattern recognition tasks. The research presented in this abstract extends the initial experimental results and mathematical accuracy proof obtained with a single predictor  to a set of predictors. This distributed model is grounded on the Continuum Neural Field Theory (CNFT) that uses global inhibition and local excitation to implement competition . External stimulations and internal predictions bias the dynamics of the field so as to constraint the selection and tracking of a target. Conflicting signals are indirectly used to filter out noise and inhibit predictors that are not adapted to the current situation (see Figure 1). The topology of the neural fields grants generalization capabilities to the system, and flexibility is thus further increased as interpolation occurs between predictors.
The performance and emergent attentional properties of the model were ascertained on a 2D visual tracking application with ambiguous and noisy signals. Results are synthesized in Table 1, averaged over 60 simulations. A percentage lower than 100% means the performance has improved with an adequate predictor. A value below 20% generally means the original CNFT equation lost the target, in contrast with the extended version.
While the predictors improve tracking performance when they adequately anticipate the dynamics, their inadequacy simply leads to a fall back on the original CNFT dynamics. This allows the system to perform correctly while learning the predictors, but also to discriminate between trajectories, as the relative level of assimilation of the dynamics is updated in real-time.
Quinton J-C, Girau B: Predictive neural fields for improved tracking and attentional properties. IEEE International Joint Conference on Neural Networks. 2011, 1629-1636.
Amari S-I: Dynamics of pattern formation in lateral-inhibition type neural fields. Biological Cybernetics. 1977, 27 (2): 77-87. 10.1007/BF00337259.
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Quinton, J., Girau, B. Spatiotemporal pattern discrimination using predictive dynamic neural fields. BMC Neurosci 13, O16 (2012) doi:10.1186/1471-2202-13-S1-O16
- Visual Tracking
- Noisy Signal
- Generalization Capability
- Pattern Discrimination
- Local Excitation