{
  "id": 10749795,
  "title": "Divergent Dopamine Dynamics within the Accumbens Core",
  "url": "https://urgent.news/2026/09/29/divergent-dopamine-dynamics-within-the-accumbens-core",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-29T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.23.753606v1?rss=1"
  },
  "original_language": "en",
  "account": "Research has illuminated the crucial role of dopamine in the nucleus accumbens core in shaping motivation and learning, however, the nature of this dopamine signal remains a mystery. Conventional theories propose a uniform dopamine signal across the core, but standard recording techniques often average dopamine levels over large tissue volumes, obscuring finer details. By employing two-photon imaging through microprisms in mice exhibiting normal behavior, scientists have uncovered a striking spatial organization of dopamine dynamics within the core. They observed that the posterior region of the core exhibited a phasic increase in dopamine in response to both rewards and aversive stimuli, and this increase was further enhanced by learning and a predictive cue. On the other hand, the anterior region of the core showed a different pattern, with dopamine levels decreasing to aversive stimuli, less pronounced increases in response to rewards, and a higher tonic dopamine level that was further amplified by cocaine use. These findings reveal that the nucleus accumbens core is not characterized by a uniform or highly fragmented dopamine signal, but rather a smoothly graded mixture of two distinct sets of dopaminergic activity. This mixed pattern of dopamine dynamics in the core challenges the prevailing notion of a canonical reward prediction error, suggesting a more complex and nuanced representation of motivational states within the brain.",
  "summary": "Dopamine in the nucleus accumbens Core powerfully influences motivation and learning, yet the information encoded by Core dopamine remains unresolved. Competing theories typically assume a spatially uniform signal, and standard recording methods average dopamine over substantial tissue volumes. Using two-photon imaging through microprisms in behaving mice, we reveal a pronounced spatial…",
  "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."
}