# Photoreceptor **Collection:** [[collections/Neurotech|Neurotech]] **Type:** Sensory cell type **Primary source:** [[articles/2026 Annual Report on Brain-Computer Interfaces|2026 Annual Report on Brain-Computer Interfaces]] ## Definition A **photoreceptor** is a sensory cell that transduces light into biological signals. ## Relationships - Photoreceptors form the input layer of visual circuits represented in fly connectomic datasets. - The annual report identifies photoreceptor regions as difficult cases for a 2025 synapse-detection model. - Photoreceptor segmentation quality affects downstream [[wiki/Synaptic Pathway|pathway]] and circuit analysis.