Neuromorphic Computing In article number 2300098, Myunghun Shin and co-workers investigate hybrid optoelectronic synaptic transistors based on β-Ga2O3. It is confirmed that the synergistic effect of optical and electrical stimulation can enable associative learning, a type of neurological behavior. The study presents an avenue for applying oxide-based devices in neuromorphic computing and confirms the utility of Ga2O3-based optoelectronic devices.