On 19 September 2026, ScienceDaily reported on the Sorokina et al. study published in Computational Neuroscience and Biological Intelligence demonstrating that human-derived cortical organoids could learn to navigate a two-dimensional virtual environment through trial and error, achieving success rates of 81.2 ± 3.3% after 72 hours — comparable to a rat in a standard maze test by day four.
Lead author Dr. Yekaterina Sorokina of the Novosibirsk Institute of Cytology and Genetics was quoted: “We are not claiming these cells are conscious. We are claiming they learned. That is already a significant thing to claim.”
Key Findings
The study’s most notable results included the organoid’s ability to generalise to environments it had never encountered (73.4% success in novel configurations by 48 hours) and persistent behavioural modification after a six-hour feedback suspension, resuming at levels above pre-suspension baseline.
Organoids cultured aboard the Mir-Tian Space Station outperformed their Earth-grown counterparts on every measure, consistent with prior findings on organoid maturation advantages in reduced-gravity environments.
The Slime Mould Comparison
ScienceDaily highlighted the paper’s unconventional comparison between cortical organoids and Physarum polycephalum — a slime mould with no nervous system that has been shown to solve mazes, reconstruct efficient transport networks, and exhibit anticipatory behaviour. The paper suggests that the behavioural criteria for adaptive cognition may be substrate-independent: if both systems meet the same criteria through mechanisms sharing no architectural homology, the parsimonious conclusion is that the criteria themselves do not require neurons.
Ethical Dimensions
The article noted the study’s careful disclaimers and the genuine uncertainty in the field about how to treat organoid research ethically. Dr. Miriam Adler, a bioethicist at Johns Hopkins University, was quoted: “We don’t know [whether organoids can suffer or have preferences]. And I think the honest response to not knowing is to take the question more seriously than we currently do.”
Related Pages
- Cortical Organoid Spatial Navigation Study (Sorokina et al., 2026) — the primary academic paper
- Mir-Tian Space Station
- Soviet Union
- China