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Weighting mechanisms in (visual) information processing

Weighting mechanisms in (visual) information processing. Dragan Rangelov Michael Zehetleitner, Hermann Müller. A brief introduction. Information processing: Selection of task relevant items Analysis of the selected items’ properties Feature-to-response mapping Response production

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Weighting mechanisms in (visual) information processing

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  1. Weighting mechanisms in(visual) information processing Dragan Rangelov Michael Zehetleitner, Hermann Müller

  2. A brief introduction • Information processing: • Selection of task relevant items • Analysis of the selected items’ properties • Feature-to-response mapping • Response production • All of them are present in any single task

  3. Selection and priming in visual search • Treisman, 1988 Expectancy benefits

  4. Intertrial priming effects • Müller et al (1995) Intertrial priming

  5. Selection and dimension weighting wc wo

  6. Alternative accounts • Mortier et al (2005) Intertrial priming

  7. Problem • Does the same or different weighting systems drive priming effects in detection and discrimination tasks? • YES – there should be significant intertrial priming even when the task changes between two trials • NO – intertrial priming effects are task specific

  8. Paradigm • Two tasks: • Singleton detection • Feature discrimination • Two dimensions • Color • Orientation • Mixed within the same block of trials

  9. Experiment 1 • 12 participants (7 female, mean age 25) • Alternating runs task sequence • Random dimension change sequence • For n-1 and n-3 intertrial distance

  10. Detection task Discrimination task

  11. Experiment 2 • 12 participants (6 female, mean age 25 years) • Randomized task sequence • Randomized dimension change sequence • For n-1 and n-2 intertrial distance

  12. Detection task Discrimination task

  13. Experiment 3 • 11 participants (4 female, mean age 25 years) • Only discrimination task • With and without distractors displays • For n-1 and n-2 intertrial distance

  14. Distractors No distractors

  15. Summary and conclusions • Intertrial priming is task specific • Effects survive several task switches • Priming generalizes across display types • Hypotheses • There are several weighting systems taking place at different processing stages • Similar dynamics but additive relation between different weighting systems

  16. Dimension weighting lab • Prof. Dr. Hermann Müller • Dr. Michael Zehetleitner • Dr. Thomas Töllner

  17. Thanks for your attention

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