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The uniform shift we found separates preparatory neural states (i.e., initial states) for seeding the local neural dynamics that would evolve in those regions of state space to produce distinct movements. This shift might thus reduce interference between multiple motor skills.pic.twitter.com/8ekZSFMWLV
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Recent behavioral studies by
@HannahSheahan and colleagues have found that when people prepare for different movements associated with different curl fields, they can learn multiple skills without interference that would otherwise hamper learning.pic.twitter.com/w0eQBrGA5I
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When leaning different curl fields sequentially, distinct uniform shifts occur, each reflecting the identity of the field applied and potentially separating motor memories. E.g., when learning opposite curl fields applied to the same target, preparatory states shift oppositely.pic.twitter.com/H409h5Dn52
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During a washout period, movement kinetics gradually reverted, but the learning-induced uniform shift of preparatory activity persisted. This persistent shift may retain a motor memory of the learned field, consistent with faster relearning observed behaviorally and neurally.pic.twitter.com/AwMSaJPbtA
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We found unexpected prominent shifts of preparatory states along a nearly orthogonal neural dimension. These changes were observed uniformly for all reaches including those unaltered by learning. This uniform shift during learning implies formation of new neural activity patternspic.twitter.com/GdBD8MQT7k
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Along certain neural dimensions constructed by linear regression, preparatory states for learning-altered reaches rotate towards preparatory states of their adjacent reaches opposite to the curl field direction. Preparatory states reassociate existing patterns with new movements.pic.twitter.com/ddCiVKJyc0
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We recorded neural activity in dorsal premotor cortex (PMd) and primary motor cortex (M1) using Neuropixels probes, Utah arrays, and V-probes, which provided access to hundreds of neurons simultaneously or pooled over sessions.pic.twitter.com/e47rC7Tbiy
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To address this question, we trained rhesus monkeys to learn a curl force field task that elicited new arm-movement kinetics for some (trained reach) but not all reach directions.pic.twitter.com/zsuyx6ityz
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