Changes in the extent of swim recovery correlated with polysynaptic actions. Changes in the extent of swim recovery correlated with polysynaptic actions.

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Changes in the extent of swim recovery correlated with polysynaptic actions. Changes in the extent of swim recovery correlated with polysynaptic actions. The amplitudes of synaptic actions of C2 and/or DSI onto VSI varied among individuals. A, C2-evoked responses in VSI. Overlaid traces of C2-evoked synaptic responses in VSI (Ai) and plots of their amplitude (Aii) are shown. The recordings were made <1 h (left) and 10–30 h (right) after PdN6 disconnection. There is a significant positive correlation between changes in the number of swim cycles 10–30 h after PdN6 disconnection (ΔSwim cycles) and changes in the amplitudes of C2-evoked depolarization (ΔVSI depolarization by C2; R2 = 0.20, p = 0.008 by a linear regression, N = 33; Aiii). The change in the resting potential of VSI showed no correlation with the change in the amplitudes of C2-evoked depolarization (Aiv). B, DSI-evoked synaptic responses in VSI. Overlaid traces of DSI-evoked responses (Bi) and plots of their amplitudes (Bii) at two different times were shown. No correlation was seen between changes in the number of swim cycles and the DSI synaptic action (Biii; p = 0.10 by a linear regression, N = 25). The change in the resting potential of VSI showed no correlation with the DSI-evoked depolarization (Biv). C, Synaptic responses of VSI to the combined stimulation of C2 and DSI (C2+DSI). Overlaid traces of the responses (Ci) and plots of their amplitudes (Cii) at two different times were shown. There is a strong positive correlation between these parameters (Ciii; R2 = 0.67, p < 0.001 by a linear regression, N = 30). The change in the resting potential of VSI showed no correlation with C2+DSI-evoked depolarization (Civ). The synaptic responses recorded in normal saline include both direct monosynaptic and polysynaptic actions, as indicated by insets above the overlaid traces. In Ai, Bi, and Ci, overlaid traces from 10 representative preparations were shifted to align together at the onset of the synaptic potentials. Akira Sakurai et al. eneuro 2016;3:ENEURO.0056-16.2016 ©2016 by Society for Neuroscience