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Extension of Superior Colliculus Based Models of Multisensory Integration to the Cortex

Extension of Superior Colliculus Based Models of Multisensory Integration to the Cortex. Michael Hadley. Multisensory Integration. Windows of interaction Convert physical properties to neural firings Integrate to create a more accurate representation. Sensory Structures.

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Extension of Superior Colliculus Based Models of Multisensory Integration to the Cortex

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  1. Extension of Superior Colliculus Based Models of Multisensory Integration to the Cortex Michael Hadley

  2. Multisensory Integration • Windows of interaction • Convert physical properties to neural firings • Integrate to create a more accurate representation

  3. Sensory Structures • Information is information • Similar hierarchy • Plasticity rules • Topographical maps • SOM

  4. Multisensory Integration in the Cortex Traditional View New Evidence

  5. Major Discoveries • Connections between sensory areas • ERP time frames of integration • Earliest window defies traditional view • Later windows fit traditional view • Convergence • Single/multi-cell recordings • Population recordings

  6. Traditional vsRecent

  7. Computational Modeling • Test hypotheses • Generation of testable predictions

  8. My Proposal • Move subcortical model to cortex • Change the model to fit cortical data • Start to put the puzzle together

  9. Definition

  10. Anastasio & Patton’s Model of the SC Modulatory projections come from parietal regions V = visual A = auditory S = somatosensory DSC stands for the deep layer of the SC Primary inputs come from sensory receptors

  11. A&P Two Stage Training • Hebb • Primary connections • Uses SOM • Extracts information • Hebb-anti-Hebb • Modulatory connections • Loosely based on opposite of Hebb • Training to produce MSE

  12. Fit with Literature • Ascending/descending from literature • Modulatory role of descending • Developmental window • Does not show MSD • No inhibition

  13. My Model

  14. Stage 1 Training of the forward sensory projections with SOM Training of the projections to association areas with SOM

  15. Stage 2 Hebb-anti-Hebb training according to traditional theories Hebb-anti-Hebb training according to new evidence

  16. Evaluation • Use definition of multisensory integration • Determine which theories are plausible • Information theory • Incorporate inhibition • Supervised learning Future

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