Integrated Contextual Representation For Objects’

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Integrated Contextual Representation For Objects’

  1. 1. Integrated Contextual Representation for Objects’ Identities and Their Locations Nurit Gronau, Maital Neta, and Moshe Bar Journal of Cognitive Neuroscience 2008
  2. 2. <ul><li>The influence of contextual processes on object recognition may stem from multiple sources of information. </li></ul><ul><ul><li>Object identities </li></ul></ul><ul><ul><li>Ex: an office typically contains a desk, a desk lamp, and a computer </li></ul></ul><ul><ul><li>Locations </li></ul></ul><ul><ul><li>Ex: phones are typically placed above, and not below desks </li></ul></ul><ul><li>Context frame: object identities + locations </li></ul>
  3. 3. <ul><li>Not all empirical findings are necessarily in agreement with this concept. </li></ul><ul><li>Contextual associations between visual objects can be independent of spatial location representations. </li></ul><ul><ul><li>Context: lack of locations </li></ul></ul><ul><ul><ul><li>Ex: priming effect </li></ul></ul></ul><ul><ul><li>Context: lack of object identities </li></ul></ul><ul><ul><ul><li>Ex: contextual cuing </li></ul></ul></ul>
  4. 4. <ul><li>We propose that a unified context frame encompasses both these two subtypes of contextual associations. </li></ul><ul><li>A global contextual representation can provide a highly coherent and meaningful representation of the visual environment. </li></ul>
  5. 5. Three critical cortex for context frame <ul><li>inferior prefrontal cortex (IPC): semantic and conceptual tasks </li></ul><ul><li>medial-temporal lobe regions (hippocampus, parahippocampal cortex [PHC]): contextual associative processing </li></ul><ul><li>lateral occipital complex (LOC): object-selective regions </li></ul>
  6. 6. EXP Task: 2 AFC decision task
  7. 7. Behavioral results
  8. 9. General discussion <ul><li>Our results demonstrate that identity-based and location-based contextual factors interact with each other during visual object recognition. </li></ul>

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