Judged: two independent readers; copy check clear.
stirrup
stirrup In this historical psychometric apparatus, the stirrup is a mechanical part attached to an armature that catches or clamps the falling rod when the subject responds.
In this historical psychometric apparatus, the stirrup is a mechanical part attached to an armature that catches or clamps the falling rod when the subject responds. It is used in measuring reaction-time by stopping the rod so the elapsed time can be read.