Figure 1.

A simple theory for cortical decision circuits and tadpole responses to a brief skin stimulus. (a) Diagram to illustrate general theory for variable delay generation (based on [3]). (b) A resting hatchling Xenopus tadpole, 5 mm long, hangs from mucus secreted by its cement gland (arrow). (c) Video frames of tadpole (dorsal view) flexing (arrowhead), then swimming following a current pulse to the right trunk (*). (d,e) RTs to the first flexion of swimming and first motor nerve activity of fictive swimming in immobilized tadpoles. (Online version in colour.)