Sometimes these responses need to be immediate, such as catching a falling cup, and sometimes they need to be delayed and timed appropriately, such as picking up and drinking from a cup. It’s not clear how primate cortex differentially prepares and executes these movements.
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We recorded in the premotor and parietal cortex of macaque monkeys during delayed grasping movements with varying amounts of preparation time. Regardless of the amount of preparation, all movements shared a common neural execution strategy.
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However, timing played a large role in delay activity. Especially in premotor cortex, it was possible to read out timing signals related to the design of the task, suggesting that these areas track the expectation of movement while generating a motor goal.
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Also, neural population activity clustered into two groups during movement initiation, showing a split between immediately cued movements and those that had to be withheld, suggesting that withholding movements engaged an additional process across the network.
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We believe our results help us to understand the impressive flexibility and speed of primate hand movements and supports the explanatory power of recording simultaneously from many neurons across multiple brain regions. Thanks for reading!
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Congrats! Looking forward to reading this. Any idea if you find differences at different depths in F5?
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Unfortunately, we can’t say much about depth since we used arrays that go down into the sulcus at various angles. Interesting question though!
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Do you have a link for poor people with no login? I’d like to read this
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