Figure 4.

MB α/β neurons are required for recalling the conditioned response to odors in cross-modal SP. A, Blocking synaptic output from c739 α/β Gal4-labeled neurons impaired odor memory retrieval in the vision → olfaction subsequence of cross-modal SP. B, Blocking the output from c739 neurons impaired odor memory retrieval of unimodal olfactory conditioning (left) but did not affect unimodal visual memory retrieval (right). C, By contrast, blocking synaptic output from NP1131 γ Gal4-labeled neurons did not affect odor memory retrieval in the vision → olfaction subsequence. D, Blocking output from NP1131 neurons impaired unimodal odor memory retrieval (left) but did not affect unimodal visual memory retrieval (right). E, Blocking synaptic output from c305a α'/β' Gal4-labeled neurons did not affect odor memory retrieval in the vision → olfaction subsequence. F, Blocking the output from c305a neurons did not significantly affect either unimodal odor memory retrieval or unimodal visual memory retrieval. Error bars are SEM. **p ≤ 0.01; ***p ≤ 0.001.