Diffusion of neuromodulators for temporal credit assignment
João Barretto-Bittar, Anna Levina, Emmanouil Giannakakis, Roxana Zeraati · 2026
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Description
João Barretto-Bittar and colleagues published a 2026 study on how brains assign credit for learning. Rewards often arrive late and vaguely. Neurons must guess which earlier activity helped. Chemical messengers called neuromodulators spread such signals. The authors model those signals as a diffusing cloud.
Their networks were spiking and sparsely connected. Error information spread locally between nearby neurons. Neurons learned from the local signal strength alone. Performance improved on three benchmark tasks. The method beat a standard comparison approach. It offers a plausible picture of learning in real brain circuits.
Catalog record
| CREATOR | João Barretto-Bittar, Anna Levina, Emmanouil Giannakakis, Roxana Zeraati |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 14 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |