Reza Shadmehr

@reziliusReza

Father, husband, scientist.

Vrijeme pridruživanja: rujan 2015.

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  1. 1. velj

    Try this interesting visual illusion on your laptop, with the image at full screen. What is the neural mechanism?

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  2. 31. sij

    Dopamine depletion tends to make animals less willing to exert effort for reward, though the willingness to prevent loss is less understood. Here, in medicated PD, the results show a reduced willingness to exert effort in order to prevent loss.

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  3. 31. sij

    They measured the willingness to produce force to attain reward or prevent loss. Healthy people tend to produce more force to prevent loss. This is also true in Parkinson's disease. But in PD, the patients show smaller loss aversion than normal.

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  4. 31. sij

    How hard would you work to prevent loss of $5? As hard as you’d be willing to work to gain $5? Most tend to work harder to prevent loss. This excellent work by explores this question and links loss aversion to dopamine.

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  5. 30. sij

    Here is 10s of heaven as recorded from the marmoset cerebellum by . All filters off. Complex spikes suppress the simple spikes. Why? Look at the membrane potential as it returns to baseline following a CS. It takes time to recover from thunder, then the rain resumes.

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  6. 26. sij

    Imagine being accepted in a good US university, going through months long vetting process to get a visa, hoping to join your wife in America, then humiliated upon arrival in LA airport, dreams crushed, sent back. Your crime? Born Iranian.

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  7. 24. sij

    Holding the head and the eyes still despite movements of the body. A superb example of the brain's steadicam. Motor control is a beautiful science.

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  8. 17. sij

    Try this beautiful essay on the essential role of beauty in the arts and sciences. "I don't think it's bad to do things because they make a measurable impact on the world, but we lose something precious if only measurable things are done."

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  9. 15. sij

    4/4 Other examples of come from and . I think about this when I play tennis: the first couple of shots are terrible before things settle down. It may be that making those errors are useful so my brain recalls how to play.

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  10. 15. sij

    3/4 It looks as though the error experience plays a role in the process of recall of previously learned behaviors. A formal model of this was developed by and is called "memory of errors".

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  11. 15. sij

    2/4 In this lovely paper by Wilsaan Joiner, people learn a task on day1. On day2, on trial1 they recall only a little of what they learned before. Now they experience one error like the one they saw before. And something amazing follows: near total recall

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  12. 15. sij

    1/4 When I make a prediction and get it wrong, I learn from my prediction error, updating my internal model. But does the error itself become a memory? That is, if I make that mistake again, do I learn differently because I've seen the error before?

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  13. 9. sij

    Four Western Univ. graduate students were among the 176 who died on the plane leaving Tehran. They were bright beautiful candles.

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  14. 8. sij

    May I be a proud dad for a moment? That's the Golden Globe for the Best Animated movie The Missing Link, made at , and that's Roxanna, our amazing artist in the puppets dept.

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  15. 7. sij

    So in a given region of the ctx, there appear to be within-region subsystems that work in parallel, each with distinct patterns of input-output connectivity.

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  16. 7. sij

    The PPC neurons also had distinct inputs: PPC->striatal cells received largely cingulate inputs, whereas PPC->MC cells received somatosensory inputs. In a decision making task, the PCC->striatal cells reflected past history of the animal, but not PPC-> MC cells.

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  17. 7. sij

    Working in the post. parietal ctx, they first labeled where the neurons projected to, either the striatum or motor cortex. They found almost no overlap: PPC neurons that went to MC avoided the striatum, and those that went to striatum avoided the MC.

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  18. 7. sij

    When one has a large number of cortical neurons, it is common to put them together as a population. Here, in lab took a different approach.

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  19. 6. sij

    At the US border north of Seattle, when a detained family asked agents why they were being questioned, an officer told them, “This is a bad time to be an Iranian”. Next time I'll choose my skin color and place of birth better.

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  20. 3. sij

    Here is a lovely Purkinje cell recorded by in a marmoset, our first one for the new decade. Filters are wide open (20Hz-6KHz), and the window size is 1s. If you pause it occasionally, you can see the naked complex spike.

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