Beginning in the 1920s, Hess had demonstrated that he could elicit behaviors such as rage, hunger and sleepiness in cats by electrically stimulating different spots in their brains with wires.

• 黑斯从1920年起就以实验显示，在猫脑不同部位植入金属丝后，给予通电刺激，可以引起像是愤怒、饥饿以及想睡等反应。