stochastic modeling of neurophysiological and behavioral
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Stochastic modeling of neurophysiological and behavioral data: attention and decision making in rats Gilberto Fernando Xavier Department of Physiology University of So Paulo http://www.ib.usp.br/labnec gfxavier@usp.br Covert attention task


  1. Stochastic modeling of neurophysiological and behavioral data: attention and decision making in rats Gilberto Fernando Xavier Department of Physiology University of São Paulo http://www.ib.usp.br/labnec gfxavier@usp.br

  2. Covert attention task (Posner, 1980)

  3. Peripheral valid (80%) cue Fixation point

  4. Peripheral valid cue 50-200 ms

  5. Peripheral valid cue Variable time interval (ms)

  6. Peripheral valid cue 50-200 ms

  7. Peripheral valid cue

  8. Peripheral invalid (20%) cue

  9. Peripheral invalid cue

  10. Peripheral invalid cue

  11. Peripheral invalid cue

  12. Peripheral invalid cue

  13. Peripheral neutral cue

  14. Peripheral neutral cue

  15. Peripheral neutral cue

  16. Peripheral neutral cue

  17. Peripheral neutral cue

  18. Symbolic valid (80%) cue

  19. Symbolic valid cue > >

  20. Symbolic valid cue

  21. Symbolic valid cue

  22. Symbolic valid cue

  23. Symbolic invalid (20%) cue

  24. Symbolic invalid cue > >

  25. Symbolic invalid cue

  26. Symbolic invalid cue

  27. Symbolic invalid cue

  28. Symbolic neutral cue

  29. Symbolic neutral cue < >

  30. Symbolic neutral cue

  31. Symbolic neutral cue

  32. Symbolic neutral cue

  33. Valid cue Neutral cue Invalid cue Reaction Time (ms) Validity effect 3 4

  34. Advantages Same sensory information in valid and invalid trials; therefore, differences are not related to sensory aspects. Same response in valid and invalid trials; therefore, differences are not related to motor aspects.

  35. Time course of a trial Time (ms) Fixation point Cue Target Response Reaction Cue Stimulus Onset Asynchrony Time (RT) (SOA)

  36. [Predictive (80%V x 20%I) x Nonpredictive (50%”V” x 50%”I”)] X [Symbolic x Peripheral] X SOAs

  37. Peripheral predictive (80% Valid : 20% Invalid) +20 Symbolic predictive RTi – RTv (ms) (80% Valid : 20% Invalid) Validity Effect 0 Symbolic nonpredictive (50% Valid : 50% Invalid) Peripheral nonpredictive -20 (50% Valid : 50% Invalid) 100 200 300 400 500 SOA (ms) Adapted from Luck and Vecera, 2002

  38. Orienting of attention in rats

  39. Peripheral cue

  40. Time course of a rat trial Time (ms) Center light Noze poke (Center) RT Cue stimulus SOA Target stimulus Remove noze MT Insert noze within target hole

  41. Multi-unit recordings in several brain areas

  42. Time course of a rat trial Time (ms) Center light Noze poke (Center) RT Cue stimulus SOA Target stimulus Remove noze MT Insert noze within target hole

  43. Symbolic cue using sounds 1000Hz 5000Hz

  44. Symbolic cue using Odors Odor A Odor B

  45. Decision making (Forced Trial) one reward four rewards immediately after a delay

  46. Decision making (Choice Trial) ? ?

  47. Serial Reaction Time Task (slow motion and real time) Click

  48. Thank you for your ATTENTION

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