Because the larger the event, the larger the number of oscillations of the transducer before they decay below the trigger level.

因为事件越大，传感器在它衰减到低于触发器电平之前的振荡次数越多。

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For the last 10 years, researchers led by William Hirst of the New School and Elizabeth Phelps of New York University have been tracking the steady decay of what people recall about that tragic event.

WSJ: Jonah Lehrer on Memory, Witnesses and Crime | Head Case