--- title: The Hidden Dimensions Behind Every Move You Make | daily.dev description: Motor cortex activity before a movement can be understood through a geometric framework called neural state space, where population activity is represented as... canonical: https://daily.dev/posts/the-hidden-dimensions-behind-every-move-you-make-qur0wzw9k twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: The Hidden Dimensions Behind Every Move You Make | daily.dev og:description: Motor cortex activity before a movement can be understood through a geometric framework called neural state space, where population activity is represented as... og:url: https://daily.dev/posts/the-hidden-dimensions-behind-every-move-you-make-qur0wzw9k og:image: https://api.daily.dev/og/posts/qUr0WZw9k.png og:image:alt: The Hidden Dimensions Behind Every Move You Make og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # The Hidden Dimensions Behind Every Move You Make **[Artem Kirsanov](https://daily.dev/sources/artemkirsanov)** · 21 min read · 0 upvotes · 0 comments ## Summary Motor cortex activity before a movement can be understood through a geometric framework called neural state space, where population activity is represented as a point moving through high-dimensional space governed by a flow field shaped by recurrent connections. Contextual inputs create a temporary fixed point during movement preparation, and this preparatory activity is confined to a 'null space' that the muscles are structurally unable to read, explaining why the arm stays still even as motor cortex encodes the upcoming reach. When a go cue removes the contextual input, the state escapes the null space into the 'potent' directions that drive muscle commands, letting one circuit generate many different movements simply by starting from different initial conditions. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Why doesn't the arm move during motor preparation if motor cortex already encodes the upcoming reach? Preparatory activity is confined to the null space of the circuit, a set of neural population states that mathematically produce zero muscle activation because they are perpendicular to the output-potent directions the muscles actually read. Since the muscle only senses the potent component of the population state, activity can be large and movement-specific in the null space without causing any muscle contraction. _For deeper dives into how neural circuits encode behavior, developers exploring computational neuroscience track explanations like this on daily.dev._ ### What is a flow field in the context of motor cortex neural population dynamics? A flow field is a geometric description assigning a direction and speed of change to every possible state of a neural population, determined by the fixed recurrent connection weights between neurons. Given the current firing rates of all neurons as a point in state space, the flow field's arrow at that point predicts where the population activity moves next, since the network's dynamics are largely autonomous and self-generated. _Those piecing together dynamical-systems models of neural circuits follow explainers like this via daily.dev._ ### How does a single motor cortex circuit generate different reaching movements toward different targets? Different target inputs cancel the recurrent flow field at different locations in neural state space, creating a movement-specific fixed point for each target. During the preparatory delay, contextual inputs park the population at that fixed point; when the go cue removes the inputs, the same recurrent wiring unspools a different trajectory from each distinct starting point, producing a different movement. _Readers curious about shared computational mechanisms behind varied outputs can find similar systems-level breakdowns on daily.dev._ ## Similar posts on daily.dev - [To flexibly organize thought, the brain makes use of space](https://daily.dev/posts/to-flexibly-organize-thought-the-brain-makes-use-of-space-edpmskgmq) · MIT News · 0 upvotes · 0 comments - [Rethinking how our brains use categories to make sense of the world](https://daily.dev/posts/rethinking-how-our-brains-use-categories-to-make-sense-of-the-world-dzwlbui8g) · MIT News · 0 upvotes · 0 comments - [Flexible brain circuits can switch between different tasks](https://daily.dev/posts/flexible-brain-circuits-can-switch-between-different-tasks-goo6u8dmk) · MIT News · 0 upvotes · 0 comments --- Tags: [#machine-learning](https://daily.dev/tags/machine-learning) [View this post on daily.dev](https://daily.dev/posts/the-hidden-dimensions-behind-every-move-you-make-qur0wzw9k) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"The Hidden Dimensions Behind Every Move You Make","url":"https://daily.dev/posts/the-hidden-dimensions-behind-every-move-you-make-qur0wzw9k","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/the-hidden-dimensions-behind-every-move-you-make-qur0wzw9k"},"datePublished":"2026-08-31T22:04:42.475Z","dateModified":"2026-08-31T22:05:05.769Z","description":"Motor cortex activity before a movement can be understood through a geometric framework called neural state space, where population activity is represented as...","image":"https://i.ytimg.com/vi/gAm5Athct6Y/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/gAm5Athct6Y/sddefault.jpg","isAccessibleForFree":true,"articleSection":"Artem Kirsanov","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Artem Kirsanov","logo":"https://media.daily.dev/image/upload/s--h-qobCHI--/f_auto/v1725038171/logos/artemkirsanov","url":"https://daily.dev/sources/artemkirsanov"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/the-hidden-dimensions-behind-every-move-you-make-qur0wzw9k","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"machine-learning","timeRequired":"PT21M","video":{"@type":"VideoObject","name":"The Hidden Dimensions Behind Every Move You Make","description":"Motor cortex activity before a movement can be understood through a geometric framework called neural state space, where population activity is represented as...","thumbnailUrl":"https://i.ytimg.com/vi/gAm5Athct6Y/sddefault.jpg","uploadDate":"2026-08-31T22:04:42.475Z","duration":"PT21M","url":"https://api.daily.dev/r/qUr0WZw9k","embedUrl":"https://www.youtube.com/embed/gAm5Athct6Y"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Artem Kirsanov","item":"https://daily.dev/sources/artemkirsanov"},{"@type":"ListItem","position":3,"name":"The Hidden Dimensions Behind Every Move You Make"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/the-hidden-dimensions-behind-every-move-you-make-qur0wzw9k#faq","mainEntity":[{"@type":"Question","name":"Why doesn't the arm move during motor preparation if motor cortex already encodes the upcoming reach?","acceptedAnswer":{"@type":"Answer","text":"Preparatory activity is confined to the null space of the circuit, a set of neural population states that mathematically produce zero muscle activation because they are perpendicular to the output-potent directions the muscles actually read. 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