Transformation of Context-dependent Sensory Dynamics into Motor Behavior
Figure 8
Specific sensory network activation phase locks correspond to a unique motor activity during hunting behavior.
The figure illustrates two representative examples of activation phase-locks among activated SRCs in a given time window (dashed rectangles) and its corresponding motor output (arrows) during different hunting episodes. (A–B) Top panels: Statocyst sequential activation patterns. The color codes for the neurons are the same as in Figure 7. Bottom panels: Motor response to the sensory activity. Blue and red traces correspond, respectively, to the firing of 1A and 2A motoneuron. The analysis reported in the text refers to 120 s simulations but here, for representation purposes, we show a fragment of 12 s. The dashed rectangles point out the specific activation phase locks as statistically selected (see Methods) for time windows in which four specific neurons are active. Panel A displays activation phase locks for SRCs 1, 2, 4 and 5 during a hunting episode characterized by long activations for neurons 1 and 3. These specific activation phase locks result in similar responses in the motor network –see also panel C– in most cases (6 out of 7 in the example shown here). In the hunting episode of panel B the activations have a similar duration in all neurons. The sequences pointed out here involve SRCs 2, 3, 5 and 6. In this case, the sensory activation phase lock always induces the same response in the wing CPG –see also panel D–. (C) PSTHs of the 1A and 2A cells characterizing the motor response during the activation phase lock illustrated in panel A. (D) PSTHs of the same cells during the phase lock illustrated in panel B. PSTHs are calculated for the entire simulations (120 s). Spikes are aligned to the beginning of the activation sequence. The activation phase lock of panel A induces in most cases the firing of motoneuron 1A, which is not accompanied by activity in 2A. On the other hand, phase locks in panel B induce the firing of 1A followed by the activation of 2A in a similar interval.