Tuesday, April 28, 2026 | 17:00 CEST
08:00 PDT | 11:00 EDT | 23:00 CST | 00:00 JST

From Self-Organization to Learning: Mouse Forebrain Organoids as Models of Network Assembly and Goal-Directed Adaptation
Brain organoids derived from pluripotent stem cells offer a powerful in vitro platform to study how neural networks self-organize and adapt. In this webinar, we present two complementary studies from our group at UC Santa Cruz. First, we describe the generation of dorsal and ventral mouse forebrain organoids and show how their distinct cellular compositions, particularly the enrichment of parvalbumin-positive interneurons in ventral organoids, give rise to divergent network topologies. Both organoid types develop small-world architecture without sensory input, but differ in modularity, hub organization, and synchronization dynamics, revealing how excitatory-inhibitory balance intrinsically shapes circuit formation (Hernandez, Schweiger et al., Stem Cell Reports 2026). Second, we demonstrate that cortical organoids can perform goal-directed learning when embodied in a pole-balancing task through closed-loop electrophysiology. Using adaptive training signals selected by reinforcement learning, organoids significantly improve their control performance in a manner which is shown to require intact glutamatergic transmission (Robbins et al., Cell Reports 2026). Together, these studies establish mouse forebrain organoids as a tractable system for investigating both intrinsic network assembly and stimulus-driven neural plasticity.