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Jeff Weiler
Dad - husband - movement neuroscientist - formerly athletic
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Jeff Weiler 25. sij
Odgovor korisniku/ci @kirkgoldsberry
What are moving dots / restricted area supposed to depict?
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Jeff Weiler 24. sij
Odgovor korisniku/ci @Stapes @ScottBHuffNY
I can't wait for you and to bring back Two Jacks in the Hold! At worst, it was the best pod cast ever
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Jeff Weiler 20. sij
Odgovor korisniku/ci @adamheimlich @hunterwalk i 2 ostali
It's bc of the ways offences need to space the floor to get good looks at corner 3s.
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Jeff Weiler 18. sij
Odgovor korisniku/ci @BeierLab
Fantastic news! Great to hear!
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Volleyball Canada 13. sij
YES! We’ve done it. has qualified for with a 3⃣ set victory over Puerto Rico in (25-21, 25-15, 25-15). The are off to Tokyo !
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Jeff Weiler 8. sij
Odgovor korisniku/ci @Jeff_Weiler
Our findings demonstrate that spinal circuits can help efficiently control the hand during dynamic reaching actions, and show that efficient and flexible motor control is not exclusively dependent on processing that occurs within supraspinal regions of the nervous system (11/11)
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Jeff Weiler 8. sij
Odgovor korisniku/ci @Jeff_Weiler
This means there is a spinal circuit that, 1) integrates info from the wrist and the elbow, 2) knows how this joint info and the arm’s orientation maps onto the hand’s movement in space, 3) produces appropriate elbow muscle activity that moves the hand to the target (10/11)
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Jeff Weiler 8. sij
Odgovor korisniku/ci @Jeff_Weiler
We found that changing the arm's orientation diametrically altered how spinal reflexes in the triceps were evoked, and in such a way that were again efficiently scaled to the hand's distance from the reaching target (9/11)
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Jeff Weiler 8. sij
Odgovor korisniku/ci @Jeff_Weiler
In the next exp participants made the same reaching movement and we applied the same mechanical perturbations, but we changed their arm orientation, which diametrically altered how the rotation of the wrist moved the hand towards the target. (8/11)
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Jeff Weiler 8. sij
Odgovor korisniku/ci @Jeff_Weiler
We also found that the spinal reflexes evoked in the triceps muscle were not proportional to how much the elbow was flexed – and thus how much the triceps was stretched - but instead were efficiently scaled to the hand’s distance from the reaching target. (7/11)
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Jeff Weiler 8. sij
Odgovor korisniku/ci @Jeff_Weiler
We found that the perturbations that moved the hand furthest from the target did so with the least amount of elbow flexion and perturbations that moved the hand towards the target did so with a large amount of elbow flexion (6/11)
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Jeff Weiler 8. sij
Odgovor korisniku/ci @Jeff_Weiler
We had participants reach to a target that required them only to extend their elbow and on a subset of trials we applied mechanical perturbations the moment they began their movement. These perturbations flexed the elbow, and simultaneously flexed or extended the wrist (5/11)
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Jeff Weiler 8. sij
Odgovor korisniku/ci @Jeff_Weiler
That result opened the door for us to address other questions. In this work we asked whether the efficient spinally-mediated stretch reflexes that help maintain the postural position of the hand can also support the efficient control of reaching (4/11)
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Jeff Weiler 8. sij
Odgovor korisniku/ci @Jeff_Weiler
The tuning of these reflexes is an efficient way to re-establish the hand’s position in space. This was surprising bc many believe the output of spinal circuits – stretch reflexes – only attempt to regulate or re-establish the angular position of individual joints (3/11)
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Jeff Weiler 8. sij
Odgovor korisniku/ci @Jeff_Weiler
Last year we showed that there is a spinal circuit that processes sensory feedback from the muscles of the wrist and elbow, and then generates stretch reflexes in elbow muscles tuned to how far the hand had been moved from a static position (2/11)
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Jeff Weiler 8. sij
& and I are excited to share our latest work on how spinal circuits contribute to efficient reaching movements . For those looking for a quick breakdown of the manuscript, this is for you! (1/11)
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Andrew Pruszynski 5. sij
Reminder that I'm looking to recruit two graduate students for Fall 2020, either in human motor control or in NHP ephys and calcium imaging. These positions are fully funded. Email me if you're interested. Please share widely.
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Rodrigo Maeda 18. stu
New preprint with using to go from feedback to feedforward control. below...
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Alex Jacob 12. stu
. There was a mistake in tonight's Final , is actually correct.
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Barack Obama 16. lis
I was proud to work with Justin Trudeau as President. He's a hard-working, effective leader who takes on big issues like climate change. The world needs his progressive leadership now, and I hope our neighbors to the north support him for another term.
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