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Figure 6. The struggling motor pattern, the neurons responsible and its mechanism of generation. (A,B) During 40-Hz skin stimuli struggling is evoked and a cIN and ecIN recorded in whole-cell mode are recruited. When stimulation stops the motor pattern switches to swimming and recorded neurons become silent. (C) Current injection into the ecIN makes it fire an action potential which produces a short latency EPSP in the cIN. (D) Longer injected current induces typical repetitive firing. (E) Measures of 1st and 10th compound IPSCs evoked in a dIN by stimulation of the opposite side show significant depression only with 100-Hz stimulation. (F) Half-center model of struggling network without length with three of each type of neuron on each side. (G) If cIN inhibition shows depression, this network can reliably generate struggling- like activity during tonic sensory excitation. (based on Li et al., 2007). Image published in: Roberts A et al. (2010) Image downloaded from an Open Access article in PubMed Central. Copyright © 2010 Roberts, Li and Soffe. Larger Image Printer Friendly View

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