tyler
@tyboydmeredith
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Joined December 2011
Very excited to have posted a new preprint on my PhD work in the @brody_lab where we show that rats can achieve near-optimal time investment in a confidence-guided waiting task
biorxiv.org
Rational decision-makers invest more time pursuing rewards they are more confident they will eventually receive. A series of studies have therefore used willingness to wait for delayed rewards as a...
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One of the neat observations from our process model is that the belief that reward is coming falls over time in this task. This means that rewards delivered later should be more surprising. it would be interesting to know if that surprise is detectable in neural data!.
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Our cognitive process model was useful for understanding where variability arises in the behavior and we hope it will guide the analysis of neural data collected from this task in the future.
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By describing the influence of relevant environmental statistics on optimal behavior in confidence-guided waiting tasks, our work will aid the interpretation of studies where waiting behavior is used as a proxy for decision confidence.
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Interestingly, the variability in our rat data was not dominated by scale invariant timing noise, but appeared more consistent with variability in the bound setting, which may stem from noise or from continual learning of the best bound setting.
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We used this model to compare the patterns of variability that we would observe if different aspects of this decision process were affected by noise. For example, we could produce scale invariant timing variability by adding noise to the drift rate.
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We developed a process model that could produce optimal waiting behavior in this task via a linear drift of a decision variable from an initial point associated with the decision confidence to a fixed bound associated with the opportunity cost.
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Compared to optimal agents, who minimized travel time, our rats spent too long at each reward opportunity. But, when we treated rats' travel times as a constraint on optimal agent behavior, their overall willingness to wait was approximately equal to the agents'.
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We worked out an expression for the reward rate in this task and asked how to maximize it. A big factor, as in any foraging task, is the travel time or switching cost when moving from one reward opportunity to the next.
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Rats can learn to modulate their willingness to wait for rewards as a function of their confidence in decisions. But, to maximize reward rate, they need to find the right overall average waiting time. Do they?
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Congrats @alexpiet!.
New paper, now out in Neuron: "Behavioral strategy shapes activation of the Vip-Sst disinhibitory circuit in visual cortex".
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RT @Nancy_Kanwisher: If you are a tenured professor in the life/neuro sciences who values open exchange of ideas in academia, please sign o….
docs.google.com
(NOTE: To our wonderful community of academics who have signed this petition, we are in awe of you. There are almost 2000 people who have signed this petition, including academics from all over the...
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if you’re enraged by the tautology “war crimes are war crimes,” seek help!.
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unbelievably ashamed of this government.
JUST IN: The US vetoed the UN Security Council’s resolution calling for humanitarian pauses in the conflict between Israel and Gaza
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RT @theHessam: When I was a child my father taught me that if you see someone being bullied at school, speak up and defend them. If you the….
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These lies make me feel insane! Barbara Lee specifically urged “restraint” and quoted clergy saying “as we act let us not become the evil we deplore”.
Nobody said on 9/11:. - “America must retaliate proportionally.”. - “Both sides need to show restraint.”. - “Where's the proof of all the dead bodies?”. - “You are oversimplifying. There is context about the conflict you're ignoring .”. - “Let's try to deescalate the situation.”
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RT @PrincetonGSU: 🔉🔉 we're completely thrilled to announce that, as of this morning, a MAJORITY of Princeton grad student workers have sign….
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RT @PrincetonGSU: Hi everyone! We're having an ✨event✨but we need your help to pull it off!. If you can spare a few bucks, here's our PayPa….
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RT @Vinncent: I find that, around 100% of the time outside the US (not just in rich countries), people are already shocked we have to pay a….
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Our new paper is out today! We found that single neurons in rat frontal cortex tracked the provisional choices inferred by our behavioral model across model-predicted changes of mind. 🧵 below. w/ @alexpiet @emilyjanedennis @zamakany @brody_lab.
nature.com
Nature Communications - A leaky accumulation model can predict rats’ changes of mind during decision making in a dynamic environment explaining reversals in frontal cortical activity and...
Finally out 😄 our new paper where we show that the rat frontal orienting fields (FOF) represent provisional choice during decision making in a dynamic environment and respond rapidly to model-predicted changes of mind: A thread/.
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