Nature Materials, Published online: 30 September 2026; doi:10.1038/s41563-026-02762-9An organic mixed ionic–electronic photosensor is developed that converts changes in illumination into transient current spikes and uses ion-mediated inhibition to program their amplitude. This in-sensor amplitude–temporal coding preserves motion-relevant information before readout, enabling spatial event weighting and energy-efficient neuromorphic visual processing in device-informed simulations.