{
  "id": 9191591,
  "title": "How the brain keeps its options straight at decision time",
  "url": "https://urgent.news/2026/09/22/how-the-brain-keeps-its-options-straight-at-decision-time",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-22T20:00:00.000Z",
  "source": {
    "name": "MIT News Research",
    "slug": "mit-news-research",
    "url": "https://news.mit.edu/2026/how-brain-keeps-its-options-straight-at-decision-time-0922"
  },
  "original_language": "en",
  "account": "A new study by neuroscientists at MIT's Picower Institute for Learning and Memory demonstrates how the brain maintains clear distinctions between options during decision-making. Published in the journal iScience, the research reveals that the brain employs coordinated patterns of electrical activity to distinctly represent and sort options, both before and after a decision is made.\n\nLead author Huidi Li, a graduate student in Professor Earl K. Miller's lab, explains that the brain doesn't hold information statically. Instead, it flexibly reorganizes information representation to meet changing task demands. To investigate this phenomenon, Li and Miller trained two animals to play a game where they had to look in the direction of one of two targets based on their assigned value. The targets and their values were presented and assigned in sequence, requiring the brain to juggle multiple representations of each target.\n\nUsing \"declassifier\" algorithms to decode the electrical patterns of hundreds of neurons in the lateral prefrontal cortex, researchers found that the neurons acted in functional ensembles. These ensembles' collective activity clearly indicated decision-related information, including target directions and assigned values. Geometrically visualizing these \"subspaces\" as planes on a 3D graph, the researchers discovered that before values were assigned and decisions were made, the neural ensemble patterns consistently represented options based on their order of presentation.\n\nAfter the decision, new ensembles provided new representations, with chosen options having parallel representations and unchosen options represented as orthogonal from the chosen ones. This consistent way of representing chosen options could aid downstream circuits responsible for converting decisions into action, allowing for the readout of the chosen target's location with a single decoder, regardless of its initial presentation order.\n\nInterestingly, individual neurons could often be recruited into different ensembles from round to round. A neuron that seemed selective for option 2 in one round might become selective for option 1 in the next. This suggests that the ensembles were not permanent circuits of specialized neurons but were instead assembled ad hoc among multifunctional neurons.\n\nThe researchers also found that the brain maintained distinct memories of each option, whether it was chosen or not. This could be crucial for assigning credit later on to facilitate learning. For example, remembering that choosing target 2 in round 3 earned a reward. The study illustrates the dynamic subspace reorganization supporting option maintenance and selection in economic decisions, which could have important implications for understanding decision-making processes in the brain.",
  "summary": "Making a decision requires juggling a set of options without getting them confused or losing track of them. A new MIT study shows how neurons encode information to maximize clarity throughout the process.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}