Alkis Hadjiosif

@AlkisMH

Postdoc in Johns Hopkins, trying to understand motor learning and control in the healthy and post-stroke brain. Opinions are own.

Vrijeme pridruživanja: listopad 2018.

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  1. 24. sij

    We confirmed this with additional experiments and analysis dealing with potential issues with target location and saturation of adaptation. 7/7

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  2. 24. sij

    We thus had people reach under a mirror reversal, isolating implicit adaptation. They couldn't compensate, instead increasing error from one trial to the next. That shows implicit adaptation is driven by direct policy updates, not forward model based learning. 6/7

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  3. 24. sij

    But direct policy learning will not deal with a mirror reversal. If you keep shifting output rightwards in response to a leftward cursor error, you will increase cursor error in the next trial. 5/7

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  4. 24. sij

    Both approaches would work to deal with a VMR. However, only learning a forward model (then inverting it) would be able to eventually deal with a mirror reversal. If the cursor goes the opposite way, why can’t you learn to predict just that? 4/7

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  5. 24. sij

    However, errors (even sensory prediction ones) could instead *directly* train the control policy, adapting motor commands. This can rely e.g. on simple rules about how errors should shift motor output: if the error is leftward, shift motor output rightward. 3/7

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  6. 24. sij

    One way is to use errors to train a forward model and then “invert” it to get the adapted motor command. Because adaptation is driven by sensory prediction error (which implies a sensory prediction, i.e. forward model output), one would think this is how things work. 2/7

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  7. 24. sij

    Our latest work with and is finally out on biorxiv! Here, we tackle the question: by which mechanism does the motor system get from sensory prediction error to adapted movement? 1/n

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  8. 7. sij

    I thought it could surface in DC where the train would stop. But apparently it went unnoticed until later, and went all the way to Boston South Station (the 'R' key is still working though). New year's resolution: better, automatic backups and being more careful 2/2

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  9. 7. sij

    A big thank you to for finding and returning my laptop! Jetlagged and tired after a two-flight then train ride coming back to Baltimore after the holidays, I half-asleep walked out of the train leaving my laptop in the pouch in front of my seat. 1/2

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  10. 31. lis 2019.

    For Halloween, I should dress up as Reviewer #2. Spooky

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  11. 23. lis 2019.

    And two more exciting findings with and Scott Albert

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  12. 23. lis 2019.

    Join me on the poster floor this morning (F37) to talk about the relationship between abnormal resting posture and active reaching/ holding after stroke - with and

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  13. proslijedio/la je Tweet

    This is the rejection letter for the work that just won the Nobel Prize. Believe in yourself. Everyone else will catch up eventually.

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    4. lis 2019.

    The full schedule for MLMC 2019 is now available at Congratulations to authors of accepted abstracts - we look forward to hearing your talks! See you in Chicago.

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  15. 25. ruj 2019.
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    10. kol 2019.

    The day before SFN there is a wonderful 1day meeting on computational motor control. The talks are selected from submitted abstracts, and often given by the lead author, a chance to shine in front of a large audience. Abstracts are due in a few weeks.

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  17. proslijedio/la je Tweet
    8. kol 2019.

    Just published from BLAM-lab. Practice induces a qualitative change in the memory representation for visuomotor learning | Journal of Neurophysiology

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  18. 19. svi 2019.

    Don't worry Edmure, you can still join the Democratic primary

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  19. 9. svi 2019.

    Is it me or is there an uncommonly high number of 50-year anniversaries this year? From neuro - , Johns Hopkins Neurology, Marr's paper - to the moon landing, Woodstock, and Stonewall

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  20. 8. svi 2019.
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