Striatal dopamine signals internal states related to behavioral performance over prolonged timescales in monkeys.
Level 5 - mechanism / opinion, no new human data
Animal neurophysiology study (rhesus monkeys)
PubMed 42427578 · doi:10.64898/2026.06.24.733789
What was done
Subsecond dopamine concentration changes were recorded across multiple sites in the caudate nucleus and putamen of rhesus monkeys during a reward-guided saccade task. Researchers evaluated how single-trial dopamine dynamics correlated with slow behavioral performance oscillations (spanning tens to hundreds of trials) compared to trial-level reward prediction errors (RPEs) and cumulative reward history.
What was found
The abstract reports no numerical values or effect sizes. Qualitatively, single-trial dopamine signals were modulated by slowly evolving performance states dissociable from RPE and cumulative reward rate. This modulation was biased prospectively toward future performance windows rather than past performance and was concentrated in the caudate nucleus rather than the putamen.
Why it matters
The findings suggest that dorsal striatal phasic dopamine signals multiplex fast reinforcement learning signals with slow prospective tracking of internal motivational states.
Limits
The study was conducted in a non-human primate model using a specific oculomotor task, limiting direct translation to human cognitive state dynamics. The abstract does not report the sample size (number of monkeys or recording sites), quantitative effect sizes, or statistical confidence intervals. As a preprint, the work has not completed peer review.
Cited by
- supports Dopamine signals can operate on multiple timescales, with fast fluctuations encoding expectation changes and slower-changing envelope signals correlating with overall motivational state.