# Photoreceptor **Entity class:** Concept or analytic term **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. <!-- BEGIN HUMANIZED RELATIONSHIPS 2026-09-11 --> This entry's documented connections are expressed in its definition and related-work routes, with provenance retained in the source-linked material. <!-- END HUMANIZED RELATIONSHIPS 2026-09-11 --> ## Related Work in the Corpus <!-- BEGIN HUMANIZED CORPUS ROUTES 2026-09-11 --> - In [[articles/2026 Annual Report on Brain-Computer Interfaces|2026 Annual Report on Brain-Computer Interfaces]], **FlyWire: Whole-Brain Completeness at Insect Scale** provides the narrative context for **Photoreceptor**: Tools developed include Codex (Connectome Data Explorer)—an open-access web interface enabling anyone with internet access to navigate neurons and synaptic pathways without downloading massive datasets, already used by over… <!-- END HUMANIZED CORPUS ROUTES 2026-09-11 -->