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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)

  4. Peripheral valid (80%) cue Fixation point

  5. Peripheral valid cue 50-200 ms

  6. Peripheral valid cue Variable time interval (ms)

  7. Peripheral valid cue 50-200 ms

  8. Peripheral valid cue

  9. Peripheral invalid (20%) cue

  10. Peripheral invalid cue

  11. Peripheral invalid cue

  12. Peripheral invalid cue

  13. Peripheral invalid cue

  14. Peripheral neutral cue

  15. Peripheral neutral cue

  16. Peripheral neutral cue

  17. Peripheral neutral cue

  18. Peripheral neutral cue

  19. Symbolic valid (80%) cue

  20. Symbolic valid cue > >

  21. Symbolic valid cue

  22. Symbolic valid cue

  23. Symbolic valid cue

  24. Symbolic invalid (20%) cue

  25. Symbolic invalid cue > >

  26. Symbolic invalid cue

  27. Symbolic invalid cue

  28. Symbolic invalid cue

  29. Symbolic neutral cue

  30. Symbolic neutral cue < >

  31. Symbolic neutral cue

  32. Symbolic neutral cue

  33. Symbolic neutral cue

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

  35. 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.

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

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

  38. 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

  39. Orienting of attention in rats

  40. Peripheral cue

  41. 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

  44. Multi-unit recordings in several brain areas

  45. 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

  46. Symbolic cue using sounds 1000Hz 5000Hz

  47. Symbolic cue using Odors Odor A Odor B

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

  49. Decision making (Choice Trial) ? ?

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

  51. Thank you for your ATTENTION

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