Figure 7. Feedback modulation enables pathway-specific plasticity in developing sensory circuits in Drosophila.
The pathway-specific plasticity of the developing nociceptive circuit in Drosophila is different from the serotonergic facilitation that occurs during sensitization of the defensive gill-withdrawal reflex in Aplysia. In the Drosophila nociceptive circuit, activity in nociceptors (“S”) leads to activation of both SONs in the circuit and serotonergic interneurons (“5-HT”), while in Aplysia gill-withdrawal reflex circuit, serotonergic interneurons are activated by another sensory pathway (S2).