Figure 1.

Techniques. A, Schematic outline of the locust mesothoracic and metathoracic ganglia, viewed in horizontal projection. Filled arrows mark stimulation sites on the bilaterally symmetric afferent tegula nerves N1C1a (open-loop experiments). Open arrows mark the stimulation sites on N1C (closed-loop and intracellular recording experiments). N1–N5, Roots of nerves 1–5. B, Top, Schematic drawings of electrode placements for extracellular stimulation of tegula nerve N1C1a and simultaneous extracellular recording of compound action potential on N1C. Bottom, During intracellular recording of interneurons and motor neurons, N1C was stimulated. C, EPSPs elicited by tegula input in model interneuron 301 at different synaptic strengths. The time constant of decay (7 ms) was unaffected by synaptic strength.