“…There is now a considerable literature on the induction of tachycardia on inspiration [3, 6, 14, 32. 41. p. 160], hyperventilation [65], exercise [16,56] change in position [7,8,11,40,49] or swallowing [25, p. 167, 29]. In 1912 Kure [30] described a 12-year-old Japanese schoolgirl who would develop paroxysms of tachy cardia, as demonstrated polygraphically, whenever she tackled an arith metical problem.…”