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Parallel vs. Serial Information Processing by v7166R

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									  Parallel vs. Serial Information
            Processing
• Remember - attention is about information
  processing
  Parallel vs. Serial Information
            Processing
• Remember - attention is about information
  processing
• A fundamental question was “how much
  information can be processed at once?”
  Parallel vs. Serial Information
            Processing
• Remember - attention is about information
  processing
• A fundamental question was “how much
  information can be processed at once?”
  – The answer seemed to be “not much” - but can
    we get a better understanding ?
  Parallel vs. Serial Information
            Processing
• Remember - attention is about information
  processing
• A fundamental question was “how much
  information can be processed at once?”
  – The answer seemed to be “not much” - but can
    we get a better understanding ?
• At issue is whether or not the brain can
  processes several items at once or must
  selectively attend to each item in turn
  Parallel vs. Serial Information
            Processing
• How could you determine that ?
  Parallel vs. Serial Information
            Processing
• How could you determine that ?
• Visual Search paradigms
             Visual Search
• Is there a green square?
             Visual Search
• Parallel search: like many independent
  spotlights
              Visual Search
• Serial search: each item is selected until
  target is found
              Visual Search
• Serial search: each item is selected until
  target is found
              Visual Search
• Serial search: each item is selected until
  target is found
              Visual Search
• Serial search: each item is selected until
  target is found
             Visual Search


• How could you test which kind of search
  was happening?
            Visual Search
• Search Slope: How long per item?
            Visual Search
• Search Slope: How long per item?
            Visual Search
• Search Slope: How long per item?
                                          Visual Search
• Serial Search - linear increase in search time
  with number of distractors
                                                 Search Slope

                               2000

                               1800

                               1600
          Response Time (ms)




                               1400

                               1200

                               1000

                               800

                               600

                               400

                               200

                                 0
                                      0     10   20       30        40   50   60
                                                      Distractors
                                         Visual Search
• Parallel search - search time is independent
  of distracter number
                                               Search Slope

                              2000

                              1800

                              1600
         Response Time (ms)




                              1400

                              1200

                              1000

                              800

                              600

                              400

                              200

                                0
                                     0    10   20       30        40   50   60
                                                    Distractors
              Visual Search
• Search slope for color singletons is flat.
  What does this tell us about color and
  attention?
Next Time: Treisman Article!

								
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