Stochastic modeling of neurophysiological and behavioral data: - - PowerPoint PPT Presentation

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stochastic modeling of neurophysiological and behavioral
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Stochastic modeling of neurophysiological and behavioral data: - - PowerPoint PPT Presentation

Oct 16, 2022 45 likes •556 views

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

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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 São Paulo

http://www.ib.usp.br/labnec gfxavier@usp.br

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Covert attention task (Posner, 1980)

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Peripheral valid (80%) cue

Fixation point

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Peripheral valid cue

50-200 ms

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Peripheral valid cue

Variable time interval (ms)

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Peripheral valid cue

50-200 ms

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Peripheral valid cue

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Peripheral invalid (20%) cue

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Peripheral invalid cue

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Peripheral invalid cue

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Peripheral invalid cue

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Peripheral invalid cue

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Peripheral neutral cue

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Peripheral neutral cue

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Peripheral neutral cue

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Peripheral neutral cue

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Peripheral neutral cue

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Symbolic valid (80%) cue

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Symbolic valid cue > >

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Symbolic valid cue

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Symbolic valid cue

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Symbolic valid cue

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Symbolic invalid (20%) cue

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Symbolic invalid cue > >

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Symbolic invalid cue

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Symbolic invalid cue

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Symbolic invalid cue

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Symbolic neutral cue

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Symbolic neutral cue < >

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Symbolic neutral cue

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Symbolic neutral cue

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Symbolic neutral cue

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3 4 Neutral cue Invalid cue Valid cue

Reaction Time (ms)

Validity effect

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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.

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Time course of a trial

Fixation point Cue Target Response Time (ms) Reaction Time (RT) Stimulus Onset Asynchrony (SOA) Cue

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

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Adapted from Luck and Vecera, 2002

Symbolic nonpredictive (50% Valid : 50% Invalid) Symbolic predictive (80% Valid : 20% Invalid) 100 200 300 400 500

SOA (ms)

  • 20

+20

Validity Effect RTi – RTv (ms)

Peripheral predictive (80% Valid : 20% Invalid) Peripheral nonpredictive (50% Valid : 50% Invalid)

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Orienting of attention in rats

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Peripheral cue

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Time course of a rat trial

Center light Cue stimulus Target stimulus Remove noze Time (ms) RT SOA Noze poke (Center) Insert noze within target hole MT

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Multi-unit recordings in several brain areas

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Time course of a rat trial

Center light Cue stimulus Target stimulus Remove noze Time (ms) RT SOA Noze poke (Center) Insert noze within target hole MT

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1000Hz 5000Hz

Symbolic cue using sounds

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Odor A Odor B

Symbolic cue using Odors

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Decision making (Forced Trial)

  • ne reward

immediately four rewards after a delay

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Decision making (Choice Trial)

? ?

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Serial Reaction Time Task (slow motion and real time)

Click

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Thank you for your ATTENTION