Ariel Levine
ariellevine.bsky.social
Ariel Levine
@ariellevine.bsky.social
Spinal cord and motor control scientist; PI at NINDS
Oh yeah. In the lab, we’ve discussed every common definition because we study gap crossing jumps and the propulsive phase is likely the closest. I believe in frogs it is truly ballistic but mammals can tune it a bit
November 23, 2025 at 7:14 PM
Yep, I’ve actually discussed it with him and stick by my argument that this would work great for some types of motor control but there are clearly ancient/core movements that this doesn’t explain well
November 23, 2025 at 7:10 PM
Totally agree. As you know, I favor thinking of motor control principles varying depending on behavior and animal.

Actually, to take inspiration from Mark Latash, his translation of Bernstein’s book is one of my favorite descriptions of how this could all work together
November 23, 2025 at 7:08 PM
Yep ;)
November 23, 2025 at 7:01 PM
Omg, multi-particular muscles are so interesting
November 23, 2025 at 7:01 PM
Doesn’t his model requires lots of feedback? Could be all different varieties
November 23, 2025 at 7:00 PM
But this is very different, no? Doesn’t he propose that the final limb location/configuration is the control parameter? This may be true for some movements (eg visually guided forelimb) but I doubt it is right for others (eg ballistic hindlimb)
November 23, 2025 at 6:59 PM
So I think of the low-d part as a control bottleneck point?
November 23, 2025 at 6:56 PM
For example, we can elicit a multi-joint flexion synergy by stimulating some spinal neurons and that works regardless of limb starting position
November 23, 2025 at 6:56 PM
Ah, I understand. But I think the stimulation studies that evoke synergies are a better case here than the ones that observe movements or EMG and do dimensionality reduction.
November 23, 2025 at 6:55 PM
Can you expand on this one too, Andrew? Curious about your thoughts on it
November 23, 2025 at 6:00 PM
Congrats, Jeff! I can’t wait to try it out
October 3, 2025 at 12:30 AM
Yes I hope so! And thanks :)
September 11, 2025 at 5:56 PM
Do you know of a third color that can be added to cyan and orange and for which the paired with overlaps are different? Thank you!
September 11, 2025 at 5:44 PM
Agreed! But do any of these work for 3 color overlap analysis on a black background? For example, in RGB, we’d want to distinguish between R+G yellow vs R+B purple. But make it colorblind friendly
September 11, 2025 at 5:42 PM