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Herein, a light\u2010induced bidirectional response is demonstrated in the proposed WSe<jats:sub>2<\/jats:sub>\/MoS<jats:sub>2<\/jats:sub> junction field\u2010effect transistor (JFET) with an extra Ge back gate. The WSe<jats:sub>2<\/jats:sub>\/MoS<jats:sub>2<\/jats:sub> JFET exhibits high responsivity and detectivity owing to effective modulation by the top junction and back dielectric gates. The unique bidirectional photoresponse and interfacial state storage properties of the device result in significant synaptic excitatory effects under visible light stimulation and remarkable synaptic inhibitory effects under infrared illumination. Optical storage with visible light and optical erasure with infrared light can be achieved in the device based on its synaptic behavior. The conductance changes under different types of illumination can be used to mimic the weight update in a neural network for image recognition. 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