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

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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 CortexMichael HadleyMultisensory Integration
  • Windows of interaction
  • Convert physical properties to neural firings
  • Integrate to create a more accurate representation
  • Sensory Structures
  • Information is information
  • Similar hierarchy
  • Plasticity rules
  • Topographical maps
  • SOM
  • Multisensory Integration in the CortexTraditional ViewNew EvidenceMajor 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
  • Traditional vsRecentComputational Modeling
  • Test hypotheses
  • Generation of testable predictions
  • My Proposal
  • Move subcortical model to cortex
  • Change the model to fit cortical data
  • Start to put the puzzle together
  • DefinitionAnastasio & Patton’s Model of the SCModulatory projections come from parietal regionsV = visualA = auditoryS = somatosensoryDSC stands for the deep layer of the SCPrimary inputs come from sensory receptors 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
  • Fit with Literature
  • Ascending/descending from literature
  • Modulatory role of descending
  • Developmental window
  • Does not show MSD
  • No inhibition
  • My ModelStage 1Training of the forward sensory projections with SOMTraining of the projections to association areas with SOMStage 2Hebb-anti-Hebb training according to traditional theoriesHebb-anti-Hebb training according to new evidenceEvaluation
  • Use definition of multisensory integration
  • Determine which theories are plausible
  • Information theory
  • Incorporate inhibition
  • Supervised learning
  • Future
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